SOLUTION: using subsition to solve the system below, what should your first step be 5x - 4y= -2 y = 2x + 2

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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.
Answer by ikleyn(52802)   (Show Source): You can put this solution on YOUR website!
.

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.

Solved.




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