There's only one solution. [ x = -7 ]
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x = 2 and x = -5
(2x + 1)(2x + 1) or (2x + 1)2 so x = -0.5
Only one: (3,-2)
2.
2x - y = 8 x + y = 1 These are your two equations. They will have two solutions since you have two variables. The solutions are x=3 and y=-2