3x+7y=-6 x+6y+2=0 I have a problem when you have to move the equation and make it into one.

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x=6+4y -3(x+y)=-36 I have to solve this using the system of equation by the substitution method.

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5a+7b=-21 a+18=-6b I have a problem when you have to move the equation and make it into one.

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if the equations are y=2x-5 and 4x-y=7 , what is the ordered pair ?

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how can written thousands equation simplified.