What is 10x-10y=0 -20x-5y=-25
2 answers:
Solve for the first variable in one of the equation, then substitute the results into the other equation (1,1)
-10x-15-(-25)
-5(2x+3-5)
-5(2x-2)
-5*2 (x-1)
= -10(x-1)
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