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OpenStudy (anonymous):
solve by using substitution? -5x+4y=20 and 10x-8y=-40 explain how to do these please, i have no idea :(
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OpenStudy (shamil98):
-5x + 4y = 20 10x - 8y = -40 solve for y.. 4y = 5x + 20 y = 5/4 x + 5 now substitute into the other equation 10x - 8 (5/4x+5)= -40 and solve for x.
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