Question

Решите систему уравнений
x2y-xy2=-70
x-y=7

Answer 1

$\left \{ {{x^{2} - y^{2} =-70} \atop {x-y=7}} \right.  \left \{ {{(7+y)^{2} - y^{2} = -70 } \atop {x=7+y}} \right.$
49+14у+у²-у²=-70
14у=-119
у=$\frac{-119}{14}$=-8,5
х=7-8,5=-1,5
Ответ:(-1,5 ; - 8,5)