Question

7x+2y = 10
3х -5y=-25

Answer 1

$1) 7x+2y=10$

$7x+2y+-2y=10+-2y$

$7x=-2y+10$

$x=-2 / 7y+10 / 7$

$2) 3x-5y=-25$

$3x-5y+5y=-25+5y$

$3x=5y-25$

$x=5 / 3y+-25 / 3$