# Lines, Lines, Lines!!! Standard Form of a Linear Equation. ~ Lesson Plan

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1 Lines, Lines, Lines!!! Standard Form of a Linear Equation ~ Lesson Plan I. Topic: Standard Form II. III. Goals and Objectives: A. The students will convert equations into standard form. B. The students will write equations in standard form. C. The students will find the coefficients of the equations. Massachusetts Learning Standards: 1. 8.P.6 Identify the roles of variables within an equation, e.g., y = mx + b, expressing y as a function of x with parameters m and b P.7 Set up and solve linear equations and inequalities with one or two variables, using algebraic methods, models, and/or graph P.2 Demonstrate an understanding of the relationship between various representations of a line. Determine a line s slope and x- and y-intercepts from its graph or from a linear equation that represents the line. Find a linear equation describing a line from a graph or geometric description of the line, e.g, by using the point-slope or slope y-intercept formulas. Explain the significance of a positive, negative, zero, or undefined slope P.8 Solve everyday problems that can be modeled using systems of linear equations or inequalities. Apply algebraic and graphical methods to the solution. Use technology when appropriate. Include mixture, rate, and work problems. IV. Materials: A. Whiteboard with dry-erase markers (Blackboard with chalk could also be used.). B. Ruler. C. Pencils. D. Calculator. E. Graphing paper. F. Standard Form Worksheets (Practice Worksheet, Quiz Worksheet). Atlantic Union Conference Teacher Bulletin Page 1 of 20

2 V. Presentation Outline: A. Introductions. "The Standard Form of a line." I. Equation II. Definition B. Write an equation in Standard Form from the given linear equation. Example C. Write an equation in Standard Form given a point and a Slope Example D. Write an equation in Standard Form given two points. Example VI. Presentation: A. Presentation Notes B. Power Point Presentation VII. Independent Practice: Standard Form Worksheet A. Class work: # 1-29 Odds B. Homework: #s 2-30 Evens C. Due 2 days from given day. Allow students to complete those questions which they did not complete in class. VIII. Topic Assessment: Standard Form Quiz A. Answer questions from homework. B. 5 Question Quiz: minutes C. 10 Question Quiz: minutes Atlantic Union Conference Teacher Bulletin Page 2 of 20

3 Lines, Lines, Lines!!! ~ Standard Form of a Linear Equation Introduction All of the linear equations we have studied so far can be written in Standard Form. The Standard form of a linear equation helps us identify its coefficients along with an easiness of graphing a line by finding the x- and y- intercept of such a line. The Standard Form is acquired when all of the criteria are met. Definitions and Formula The Standard Form of a linear equation is following criteria must be met:. However, each of the A, B, and C are integers. Remember: Integers are positive and negative numbers including zero which do not have fractions or decimals. i.e. (...-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5...). A, B, and C's greatest common factor is 1. Remember: When two numbers have a greater common factor of 1, then they cannot be divided by any other number than one. i.e. (3 and 5), (10 and 7), (3, 9, and 8), (-4, 11). 'A' is greater than or equal to Zero. A and B are not both Zero. Atlantic Union Conference Teacher Bulletin Page 3 of 20

4 Key Concepts It is important to learn how to recognize when an equation is in the Standard form and when it is not. The following lines are in Standard Form A. Where A = 5, B = -7, and C = 6 B. Where A = 1, B = 3, and C = 0 C. Where A = 1000, B = 10,000, and C = 1 D. Where A = 0, B = 1, and C = 4 The following lines are not in Standard Form: A. 'A' and 'B' must be on the same side. B. 'A' must be greater than or equal to Zero. C. These numbers can be divided by 7. D. is not an integer. E. 0x + 0y = 4 'A' and 'B' can't both be Zero. The following lines are in the form of other equations which we will learn or have learned: A. y = mx + b Slope-Intercept Form B. Point-Slope Form C. Ax + By = C Standard Form D. y = b Horizontal Line (Zero Slope) E. x = b Vertical Line (Undefined Slope) Atlantic Union Conference Teacher Bulletin Page 4 of 20

5 Let's see a few ways to use or find the Standard Form of a linear equation. 1. Write an equation in Standard Form from the given linear equation. A. i. Original equation. ii. Add -4x to both sides. iii. Simplify. A = 4, B = 1, and C = 8 B. i. Original equation. ii. Subtract 8 from both sides. iii. Simplify. iv. Add -9y to both sides. v. Simplify. A = 3, B = 9, and C = -8 C. i. Original equation ii. Multiply all terms by 5. iii. Simplify. iv. Subtract 3x from both sides. Atlantic Union Conference Teacher Bulletin Page 5 of 20

6 v. Simplify. vi. Multiply all terms by -1. vii. Simplify. A = 3, B = -5, and C = -25 D. i. Original equation. ii. Multiply all terms by 12. iii. Simplify. A = 8, B = -3, and C = Write an equation in Standard Form given a point and a slope. Note: It is always best to used the Point-Slope Form of an equation when the only information given is one point and the slope of the linear equation. A. m = and point (3, 4) i. Point-Slope Form. ii. Substitute the information given. iii. Simplify using the Distributive Property. iv. Multiply all terms by 2. v. Simplify. Atlantic Union Conference Teacher Bulletin Page 6 of 20

7 vi. Subtract both by sides by x. vii. Simplify. viii. Add 8 to both sides. ix. Simplify. x. Multiply all terms by -1. xi. Simplify. A = 1, B = -2, and C = -5 B. m = 1 and point (-2, 1) i. Point-Slope Form ii. Substitute the information given. iii. Simplify using the Distributive Property. iv. Subtract both by sides by x. v. Simplify. vi. Add 1 to both sides. vii. Simplify. viii. Multiply all terms by -1. ix. Simplify. A = 1, B = -1, and C = -3 Atlantic Union Conference Teacher Bulletin Page 7 of 20

8 C. m = -3 and point (0, -8) i. Point-Slope Form ii. Substitute the information given. iii. Simplify using the Distributive Property. iv. Simplify. v. Subtract both by sides by 8. vi. Simplify. vii. Add 3x to both sides. viii. Simplify. A = 3, B = 1, and C = Write an equation in Standard Form given two points. Note: (The following examples were used on the previous lesson on Slope-Intercept Form) A. Write an equation of the line in Standard Form which passes through (-1, 4) and (1, -2). i. Find the slope between the two points. ii. Find the value of the y-intercept (b) by substituting the value of one of the points into the equation. iii. Simplify and solve. iv. Substitute the value of b into the equation. v. Add -3x to both sides. vi. Simplify. A = 3, B = 1 and C = 1 Atlantic Union Conference Teacher Bulletin Page 8 of 20

9 B. Write an equation of the line in Standard Form which passes through (5, -3) and (-4, 3). i. Find the slope between the two points. ii. Find the value of the y-intercept (b) by substituting the value of one of the points into the equation. iii. Simplify and solve. iv. Substitute the value of b into the equation. v. Add to both sides. vi. Simplify. vii. Multiply all terms by 3. viii. Simplify. A = 3, B = 3 and C = 1 C. Write an equation of the line in Standard Form which passes through (-1, 2) and (3, 4). i. Find the slope between the two points. ii. Find the value of the y-intercept (b) by substituting the value of one of the points into the equation. iii. Simplify and solve. Atlantic Union Conference Teacher Bulletin Page 9 of 20

10 iv. Substitute the value of b into the equation. v. Subtract from both sides. vi. Simplify. vii. Multiply all terms by -2. viii. Simplify. A = 1, B = -2 and C = -5 Atlantic Union Conference Teacher Bulletin Page 10 of 20

11 Standard Form of a Line ~ Student Practice Worksheet Name Date Grade Write an equation in Standard Form given a line in slope-intercept form. 1. y = 2. y = 3. y = 4. y = 5. y = 6. y = 7. y = 8. y = 9. y = 10. y = Write an equation in Standard Form given two points. 11. (-3, 1) and (5, 4) 12. (5, -6) and (2, 3) Atlantic Union Conference Teacher Bulletin Page 11 of 20

12 13. (2, -2) and (-6, 1) 14. (3, 4) and (-7, 4) 15. (0, -2) and (7, 0) 16. (-5, -1) and (4, -7) \ 17. (1, 0) and (4, 1) 18. (-2, 0) and (0, -2) 19. (-1, -2) and (1, 4) 20. (-2, 5) and (-1, 2) Write an equation in Standard Form given a point and a Slope. 21. (2, 3), m = (-4, 7), m = (0, 3), m = (7, 2), m = (3, 2), m = 26. (2, -3), m = 27. (1, 2), m = (3, -1), m = (-2, 5), m = (3, 5), m = Atlantic Union Conference Teacher Bulletin Page 12 of 20

13 Standard Form of a Line ~ Student Practice Worksheet Answer Key Name Date Grade Write an equation in Standard Form given a line in slope-intercept form. 1. y = 2. y = 7x 10y = -8 4x + 5y = y = 4. y = 4x + 10y = 3 7x + 7y = 4 5. y = 6. y = 3x + 7y = -4 x 5y = y = 8. y = 6x + 6y = 1 2x + 10y = y = 10. y = 2x 5y = 2 4x 7y = -5 Write an equation in Standard Form given two points. 11. (-3, 1) and (5, 4) 12. (5, -6) and (2, 3) 3x 8y = -17 3x + y = 9 Atlantic Union Conference Teacher Bulletin Page 13 of 20

14 (Standard Form Worksheet answer key) 13. (2, -2) and (-6, 1) 14. (3, 4) and (-7, 4) 3x + 8y = -10 y = (0, -2) and (7, 0) 16. (-5, -1) and (4, -7) 2x 7y = 14 2x + 3y = (1, 0) and (4, 1) 18. (-2, 0) and (0, -2) x 3y = 1 x + y = (-1, -2) and (1, 4) 20. (-2, 5) and (-1, 2) 3x y = - 1 3x + y = -1 Write an equation in Standard Form given a point and a Slope. 21. (2, 3), m = (-4, 7), m = 3 3x y = 3 3x y = (0, 3), m = (7, 2), m = -5 4x + y = 3 5x + y = (3, 2), m = 26. (2, -3), m = 2x 3y = 0 3x + 2y = (1, 2), m = (3, -1), m = -1 7x y = 5 x + y = (-2, 5), m = (3, 5), m = 4x + y = -3 5x 3y = 0 Atlantic Union Conference Teacher Bulletin Page 14 of 20

15 Standard Form of a Line ~ Student Practice Worksheet Rubric Mechanics Criteria No major math Major math errors errors or serious or serious flaws flaws in reasoning. in reasoning. No math errors May be some serious math error or flaws in reasoning. Blank answers Quiz Grading Rubric: Problem Total points of Correct Answer Problem Total points of Correct Answer Total: Atlantic Union Conference Teacher Bulletin Page 15 of 20

16 Standard Form of a Line ~ Quiz Name Date Grade Write an equation in Standard Form given a line in slope-intercept form. 1. y = -2x x = 8y 4. y = 5. y = Write an equation in Standard Form given a point and a slope. 6. (2, -4), slope = (3, 1), slope = ½ 8. (-1, 2), slope = 2 9. (-4, 0), slope = ¾ 10. (-3, -3), slope = Atlantic Union Conference Teacher Bulletin Page 16 of 20

17 Write an equation in Standard Form given two points. 11. (4, -2) and (8, 3) 12. (2, 10) and (8, 7) 13. (7, 3) and (8, 5) 14. (5, 7) and (8, 5) 15. (10, 3) and (7, 9) Atlantic Union Conference Teacher Bulletin Page 17 of 20

18 Standard Form of a Line ~ Quiz Answer Key Name Date Grade Write an equation in Standard Form given a line in slope-intercept form. 1. y = -2x x + y = -18 2x + 15y = x = 8y 4. y = x + 4y = 5 x 7y = 7 5. y = 5x + y = -4 Write an equation in Standard Form given a point and a slope. 6. (2, -4), slope = (3, 1), slope = ½ x + y = -2 x 2y = 1 8. (-1, 2), slope = 2 9. (-4, 0), slope = ¾ 2x y = 4 3x 4y = (-3, -3), slope = 7x 3y = - 12 Atlantic Union Conference Teacher Bulletin Page 18 of 20

19 (Standard Form Quiz Answer Key continue) Write an equation in Standard Form given two points. 11. (4, -2) and (8, 3) 12. (2, 10) and (8, 7) 5x 4y = 28 x + 2y = (7, 3) and (8, 5) 14. (5, 7) and (8, 5) 2x y = 11 2x + 3y = (10, 3) and (7, 9) 2x + y = 23 Atlantic Union Conference Teacher Bulletin Page 19 of 20

20 Standard Form of a Line ~ Quiz Rubric Mechanics Criteria No major math Major math errors errors or serious or serious flaws flaws in reasoning. in reasoning. No math errors May be some serious math error or flaws in reasoning. Blank answers Quiz Grading Rubric: Problem Total points of Correct Answer Problem Total points of Correct Answer Total: Atlantic Union Conference Teacher Bulletin Page 20 of 20

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