Question

5x-y=10
7x-5y=7
Resolver por el metodo de suatitucion​

Answer 1

Explicación paso a paso:

$\begin{bmatrix}5x-y=10\\ 7x-5y=7\end{bmatrix}\\\\\\\begin{bmatrix}7\cdot \frac{10+y}{5}-5y=7\end{bmatrix}\\\\\\\begin{bmatrix}\frac{70-18y}{5}=7\end{bmatrix}\\\\\\\frac{5\left(70-18y\right)}{5}=7\cdot \:5\\\\\\70-18y=35\\\\\\-18y=-35\\\\\\y=\frac{35}{18}$

x=$\frac{10+\frac{35}{18}}{5}$

x=$\frac{43}{18}$