The function f(x) is shown on the graph. What is fo)?
18
O O only
16
O 6 only
12-
0 -2,-1, 1, and 3 only
O -6, -2,-1, 1, and 3 only
9
6
3
12
2
3
-9
12-
-15
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step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18