x2+7xy=-6; 9y2-xy=10

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x2 + 7*x*y = -6

$$7 x y + x_{2} = -6$$

9*y2 - x*y = 10

$$- x y + 9 y_{2} = 10$$

or

$$\begin{cases}7 x y + x_{2} = -6\\- x y + 9 y_{2} = 10\end{cases}$$

Rapid solution

$$x_{1} = \frac{9 y_{2} - 10}{y}$$
=
$$\frac{9 y_{2} - 10}{y}$$
Упростить
=

(-10 + 9*y2)/y

$$x_{2 1} = - 63 y_{2} + 64$$
=
$$- 63 y_{2} + 64$$
Упростить
=

64 - 63*y2