Question

Which of these are the intercepts of the graph of y = 3x – 12?

Answer 1

x-intercept: 4

y-intercept: -12

Explanation:

Well our formula is y=mx+b where m is the slope and b is the y-intercept. -12 takes the place of the b, so -12 is the y-intercept.

To find the x-intercept, we need to make y=0.

0=3x-12

Add 12 to both sides

12=3x

Divide both sides by 3

x=4

The x-intercept is 4 and the y-intercept is -12.

Answer 2

The answer is (4, 0), (0, -12)

y = 3x - 12

x-intercept:

y = 0

0 = 3x - 12

12 = 3x

x = 12/3

x = 4

Intercept: (4, 0)

y-intercept

x = 0

y = 3 * 0 - 12

y = 0 - 12

y = -12

Intercept: (0, -12)