SOLUTION: Solve the system by substitution. y=−4x y=3x+28

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Question 1204538: Solve the system by substitution.
y=−4x
y=3x+28
Answer by mananth(16949) About Me  (Show Source):
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Solve the system by substitution.
y=−4x
y=3x+28
substitute y in y=3x+28
-4x =3x+28
subtract 3x from both sides
-4x-3x = 3x-3x+28
-7x = 28
/-7

x = 28/-7
x=-4
y=-4x
y=(-4)(-4)=16
The solution
x = -4
y = 16