x = -5
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2x - y = 15 2x + 3y = -21 As you observe both equations (having different slopes), you see that the system is consistent, and it has only one solution.
X=7
x2 + 2x - 15 = (x - 3)(x + 5)
2x + 3 = 72x = 4x = 2
Not sure what you mean; that equation certainly has a solution.