SOLUTION: Solve the system by addition 2x-4y=7 4x+2y=9 Please help solve

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Question 69341: Solve the system by addition
2x-4y=7
4x+2y=9
Please help solve
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
2X-4Y=7 NOW MULTIPLY THE SECOND EQUATION BY 2 & ADD.
8X+4Y=18
-------------------------
10X=25
X=25/10
X=2.5 ANSWER. NOW SUBSTITUTE 2.5 FOR X & SOLVE FOR Y
4*2.5+2Y=9
10+2Y=9
2Y=9-10
2Y=-1
Y=-1/2 ANSWER