Question

HELP PLZ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

Answer:

D. $x=-5,y=\frac{5}{4}$

Step-by-step explanation:

$\begin{bmatrix}5x+4y=-20\\ 5x+12y=-10\end{bmatrix}$

Subtract Equation 2 - Equation 1:

$5x+12y=-10\\-\\\underline{5x+4y=-20}\\8y=10$

Divide both sides by 8:

$\frac{8y}{8}=\frac{10}{8}$

$y=\frac{5}{4}$

Substitute $y=\frac{5}{4}$ into Equation 1:

$5x+4y=-20$

$5x+4\times \frac{5}{4}=-20$

$5x+5=-20$

Subtract 5 from both sides:

$5x+5-5=-20-5$

$5x=-25$

Divide both sides by 5:

$\frac{5x}{5}=\frac{-25}{5}$

$x=-5$

Answer 2

Answer:

c

Step-by-step explanation: