Question

If x+y = -10 and x-y = 2 what is the value of x

Answer 1

x = -4

Explanation:

The solution to a "sum and difference" system of equations can be found by adding the equations together.

(x +y) +(x -y) = (-10) +(2)

2x = -8 . . . . . . simplify

x = -4 . . . . . . . divide by 2

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Additional comment

y = -6, though this question did not ask that value.