x and y are variables, so unless you define their values, this question has no definite answer. but, i can simplify it for you: xy-8, x*y-8, (xy)-8, xy+-8. There are a lot more ways, but i recommend you use XY-8.
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8 , and 7. x+y=15 >> x=-y+15 x*y=56 >> y*(-y+15)=56 , then solve for y , put y back into either equation for x.
x + y = 10 y = x + 8 so, x + (x + 8) = 10 2x + 8 = 10 2x + 8 - 8 = 10 - 8 2x = 2 x = 1 and y = 9 because y = x + 8 y = 1 + 8 y = 9
If you mean: y = x+4 and y = 3x+8 then x = -2 and y = 2
Suppose the numbers are x and y.Then (x - y)^2 = x^2 - 2xy + y^2 = x^2 + y^2 - 2xyThat is 8^2 = x^2 + y^2 - 2*1764 = x^2 + y^2 - 34So x^2 + y^2 = 64 + 34 = 98.
(x+y)/2