5x = 2x-15
3x = -15
x = -5
substitute x = -5 into one of your equations
so y = 5x becomes y = 5 x -5
y= -25
x=-5 and y=-25
It has 1 pair of parallel sides.
So we have the following system of equations:

We need to solve it by substitution. This means that we have to take the expression for x given by the second equation and replace x with it in the first equation:

So y=-1. If we use this value in the second equation:

So we have x=2 and y=-1 which means that there's one solution. Then the correct answer is A and the solution is (2,-1).
Answer:
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