Lesson #3 - Writing Equations of Lines

What is the form of the equation used to write the equation of a line (y = mx + b)?

• General form

• Standard form

• Slope-intercept form

• Point-slope form

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

What is the slope of the line in the graph shown in exercise 1?

• -3

• 3/2

• 3

• 2/3

Tags

CCSS.8.EE.B.5

What is the y-intercept of the line in the graph shown in exercise 1?

• 5

• 2

• 3

• 4

What are two points with integer coordinates that lie on the line in exercise 2?

• (-1, 5) and (5, 4)

• (2, 5) and (5, 17)

• (0, 5) and (5, 3)

• (-1, 5) and (5, 3)

What is the slope of a line that passes through the points (2, 5) and (5, 17)?

• 4

• 1/4

• 1/3

• 3

Tags

CCSS.8.EE.B.5

What is the y-intercept of the blue line?

• 2

• -4

• 4

• 3

What is the slope of the line that passes through the points (-1, 11) and (4, -4)?

• -5/3

• -5

• 3

• -3

Tags

CCSS.8.EE.B.5

When finding the equation of the line through two points, what are the steps?

• 1. 1. Plug the points in to y=mx+b

  2. 2. Write the equation

  3. y = mx + b

• 1. 1. Find the y-int (b)

  2. 2. Plug in either point into x and y.

  3. 3. Write the equation

  4. y = mx + b

• 1. 1. Find the slope (m) using the given points

  2. 2. Use one of the y-values as your b.

  3. 3. Write the equation.

  4. y = mx + b

• 1. 1. Find the slope (m).

  2. 2. Plug either point into x and y and the slope into m and solve for b.

  3. 3. Write the equation using the m and b.

  4. y = mx + b

What is the slope of the line that passes through the points (2, 3) and (-2, -4)?

• 7/4

• -4/7

• 4/7

• -7/4

Tags

CCSS.8.EE.B.5

What are the two points that can be created using the information in Exercise #4?

• (1,72) and (3,188)

• (0,72) and (0,188)

• (1,3) and (72,188)

• (72,1) and (188,3)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6