You can
put this solution on YOUR website!y=x-5
3x-4(y-2)=28-x
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substitute the 1st into the 2nd equation:
3x -4(x-5-2) = 28-x
3x -4(x-7) = 28-x
3x -4x + 28 = 28 -x
-x 28 = 28 - x
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This is true for all values of "x".
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Cheers,
Stan H.
