Question

If $D_x=-18$ and $D=3$ are the values of the determinants for certain simultaneous equations in $x$ and $y$, Find $-x$.

Answer 1

Given: $D_x=-18$ and $D=3$
Thus we know $x=\frac{D_x}{D}$
$\Rightarrow x=$ $\frac{-18}{3}$ $=-6$

Therefore, $-x$ will be equal to $6$.