SOLUTION: solve the system by substitution: 4x-4y=0 y=2x-5

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Question 107809: solve the system by substitution:
4x-4y=0
y=2x-5
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
substituting the value of y from the second equation into the first equation gives 4x-4(2x-5)=0

4x-8x+20=0 ... 20=4x