Question

What are the x- and y-intercepts for the graph of 3x + y = 15?

x-intercept = −3
y-intercept = 15


x-intercept = 3
y-intercept = 1


x-intercept = −3
y-intercept = 1


x-intercept = 5
y-intercept = 15

Answer 1

x-intercept = 5

y-intercept = 15

Explanation:

Change the equation to slope-intercept form: y = -3x + 15

You have the y-intercept in that equation already, so you know it's 15. To find the x-intercept, substitute 0 in for y and solve algebraically.

0 = -3x + 15

-15 = -3x

5=x