Question

Julie wanted to find the intercepts of the graph of the equation 9x - 3y = 36.

She decided to put the equation in slope-intercept form first. Here is her work:
9x-3y = 36
3y = 36-9x
y = 12-3x
She concluded that the x-intercept is (3,0) and the y-intercept is (0,12) .
What error did Julie make?

Answer 1

Error -3y = 36 - 9x.
3y is negative.

x intercept 9x = 36

x intercept = 36/9 = 4

x-intercept (4,0)

y-intercept: -3y = 36

y-intercept = 36/-3 = (0,-12

y-intercept (0,-12)

Explanation: