Question

What ordered pair represents the y-intercept of the graph of x+y=9?

A.) (0, 9)
B.) (9, 0)
C.) (0, -9)
D.) (-9, 0)

Answer 1

We can rearrange

x + y = 9

in to

y = 9 - x


This means the value of y is EQUAL to 9 minus the value of x.


[A] fits this description, because y (9) is equal to 9 minus x (0).

[B] does too, because y (0) is equal to 9 minus x (9).