Question7) $\begin{array}{l}-4 x+y=6 \\ -5 x-y=21 \\ x=-3, y=-6\end{array}$

Studdy Solution
Substitute $x = -3$ and $y = -6$ into the second equation $-5x - y = 21$.
$$-5(-3) - (-6) = 21$$
Calculate:
$$15 + 6 = 21$$
Since the left side equals the right side, the second equation is satisfied.
The given values $x = -3$ and $y = -6$ satisfy both equations in the system.