Suppose A and B represent linear expressions. If A+ B=2x -2 and A -B=4x-8, how do you find A and B?
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A+B=2x-2
A-B=4x-8
2B=-2x+4
B=-x+2
substitute this value in equation one
A-x+2=2x-2
A=3x-4
Therefore
(A,B)=(3x-4,-x+2)
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