3x+4y=-16 and 5x+5y=-5

Mathematics

1 answer:

GuDViN [60]2 years ago

3 0

Answer:

$y=-13,\:x=12$

Step-by-step explanation:

$\begin{bmatrix}3x+4y=-16\\ 5x+5y=-5\end{bmatrix}\\\\\begin{bmatrix}5\cdot \frac{-16-4y}{3}+5y=-5\end{bmatrix}\\\\$

$-\frac{80}{3}-\frac{5y}{3}=-5\\y=-13\\\\x=\frac{-16-4\left(-13\right)}{3}\\x=12$

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