Solve the system by substitution.
2 answers:
D x= -9
Y=9
Because 4(-9)+45=9
I just put in each one and d got it right.
Y = -x
y = 4x + 45
-x = 4x + 45
<u>- 4x - 4x </u>
<u>-5x</u> = <u>45</u>
-5 -5
x = -9
y = 4x + 45
y = 4(-9) + 45
y = -36 + 45
y = 9
(x, y) = (-9, 9)
It is equal to B.
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