Question 1162304: using subsition to solve the system below, what should your first step be
5x - 4y= -2
y = 2x + 2 Found 2 solutions by Alan3354, ikleyn:Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! using subsition [sic] to solve the system below, what should your first step be
5x - 4y= -2
y = 2x + 2
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It should be whatever you want to do.
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I would sub for y in the 1st equation, but "should" makes no sense in a math problem.
Based on the second equation, REPLACE "y" in the first equation by (2x+2).
You will get then
5x - 4*(2x+2) = -2.
Simplify and find x
5x - 8x - 8 = -2
-3x = -2 + 8
-3x = 6
x = = -2.
Then y = 2x + 2 = 2*(-2) + 2 = -4 + 2 = -2.
ANSWER. x= -2; y= -2.
