4x+3y=2

-x+7y=15

$\displaystyle \begin{bmatrix}{d11}{d12}&\\{d21}{d22}\end{bmatrix }$ . $\displaystyle \frac{x}{y}=\frac{b1}{b2}$

$\displaystyle \frac{x}{y}=\begin{bmatrix}{A}\end{bmatrix}^{-1}\frac{b1}{b2}$

$\displaystyle \begin{bmatrix}{4}&{3}\\{-1}&{7}\end{bmatrix}^{-1}\frac{2}{15}=\frac{x}{y}$

this is where im getin confused. do i need to find the inverse matrix then multiply out to get answer? im geting very big values

many thanks