Solve each system by substitution

Y=4x-17 -12x+3y=-51
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2 Answers

 y=4x-17

 -12x+3y=-51, divide through by 3: -4x+y=-17.

But if we arrange this we get y=4x-17, the same as the first equation.

So in effect we only have one equation, which has an infinite number of solutions because it defines a relationship between x and y, which is the graph of an infinitely long straight line.

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y=x+8 y=4x-1
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