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If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.
y=-5x-17 y=x-1 -5x-17=x-1 -17=6x-1 -16=6x 2 2/3=x then you plug in the x for each of the equations to make sure that the answer you get is correct. ;)
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