Question

Im getting an answer that i dont know if its correct so pls help me

solve the system of equations

Answer 1

`\bf \begin{array}{llll} 18x-y=24&\implies &\quad 18x-y=24\\ 9x+4y=-15&\boxed{* -2}\implies &-18x-8y=30\\ &&--------\\ &&\qquad 0-9y=54 \end{array}\\\\ -----------------------------\\\\ -9y=54\implies y=\cfrac{54}{-9}\implies \boxed{y=-6} \\\\\\ \textit{now, let's use that`