You can put this solution on YOUR website! y=x+5
3x-3y=-15
First, you need to put the second equation in to slope-intercept form (y=mx+b)
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3x - 3y = -15
-3y = -3x - 15 (divided everything by -3)
y = x + 5
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1st: y = x + 5
2nd: y = x + 5
Your graph is going to be the same line. Therefore the answer is Infinite solutions.
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