Question

What is the y-intercept of the graph: 3x – 9y = 18.
A. 0,2
b.0,-2
is it A.

Answer 1

Now plug in x = 0 and solve for y

3x – 9y = 18

3(0) – 9y = 18

0 - 9y = 18

-9y = 18

y = 18/(-9)

y = -2

So the y-intercept is (0,-2)

Answer 2

So you were close, just off by a sign

Answer 3

okay thank you. i wasnt sure if the negative was with the 9.

Answer 4

yes subtract 9y is the same as adding -9y

Answer 5

got it. thank you

Answer 6

yw