if you meant 2x²+y²-xy=21
x=(±sqrt(-7 y^2+168)+y)/4
y=(±sqrt(-7 x^2+84)+x)/2
(x - 1)(2x + y)
mid point of xy
xy + y = z xy = z - y (xy)/y = (z - y)/y x = (z - y)/y
4
true
It equals y+1
x+xy=8 xy=-x+8 y=-1+8/x
2 (2x2 + 2x + xy + y ) it's 2 (2x + y)(x + 1) if you're doing A+
x and y are being combined using a binary operation called "plus" and the result is xy.
(2x - 3y)(x + y)
xy + xy = 2xy
between X and Y