Science and Mathematics for Engineering 6th Edition by John Bird

Exercise 13

Solve the simultaneous equations:
(a)
$\begin{array} { l } 2 x + y = 6 \\5 x - y = 22\end{array}$

(b) $4 x - 3 y = 11$
$3 x + 5 \mathrm { y } = 30$