Question

Solve 2a5b=-19
3a+5b=9

Answer 1

a=28, b=-15

Explanation:

`Method\ by\ linear\ combinaisons\\\left\{\begin{array}c2a+5b&=&-19&-1&3\\3a+5b&=&9&1&-2\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\5b&=&-75\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\b&=&-15\\\end{array}\right.\\`