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Only 1.
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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
x = 4y = 1Only one solution:x = 1y = 0.25
1 SOLUTION
One because if x3 = 1 then x must equal 1
Infinitely many: they are the same line!
1 solution
It has two equal solutions for x which are x = 2 and x = 2
x = 7