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)

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).

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