Linear Equations

What does "m" represent in y=mx+b?

• y-intercept

• slope

• macaroni

• nothing

Write the equation of the line.

• y = -1/3x - 2

• y = 1/3x - 2

• y = 3x - 2

• y = -3x - 2

Answer explanation

The slope is positive. Starting with the point on the left, rise is 1 and run is 3.

Convert this equation into slope-intercept form: 3x + y = 12

• y = -3x +12

• x = y + 4

• x = y + 12

• y = 3x -12

Convert this equation into slope-intercept form. x + y = 4

• y = x + 4

• y = -x + 4

• x = -y + 4

• x= y - 4

Which of the following represents the equation of a line that passes through the points (1,2) and (3,8)?

• 2

• 3

• -3

• 0

• y = 2x - 6

• y = -2x + 6

• y = -10x + 30

• y = 10x - 30

Find the x and y intercepts
4x - 5y = 40

• x intercept is 10 
  y intercept is 8

• x intercept is 10
  y intercept is 20

• x intercept is 8
  y intercept is 10

• x intercept is 10
  y intercept is -8

Answer explanation

x-int: set y = 0 so 4x = 40 & x = 10
y-int: set x = 0 so -5y = 40 & y = -8

What is the y-intercept of the graph of 3x + 4y = 24

• -6

• 6

• 15

• -15

Answer explanation

Set x = 0, So 4y = 24 and y = 6