To solve for 2 unknown variables you need 2 independent equations. You have only 1.
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x+y does not equal 10, which can be written x+y ~= 10 or x+y != 10.
2x+y = 10 x +y = 4 Subtract bottom equation from top equation: x = 6 Substitute the value of x into the equations to find the value of y: x = 6 and y = -2
9 plus 7 equals 144. Generally, x plus y = x(x+y).
x = -8, y = 10