SOLUTION: Im working on solving linear equations by elimination. whats 2x+5y=12 and -4x+4y=18

Question 695908: Im working on solving linear equations by elimination.
whats 2x+5y=12 and -4x+4y=18
Answer by Stitch(470) (Show Source): You can put this solution on YOUR website!
Given: and
Start by setting the equations equal to zero.
and
Multiply the first equation by -2

Since both eqautions are equal to zero, you can set them equal to each other.

Add 4X to both sides

Add 10Y to both sides

Add 18 to both sides

Divide both sides by 14

-----------------------------
Now plug 3 into one of the given equations for Y

Subtract 15 from both sides

Divide both sides by 2

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