Question

3x+y=9 2x-y=11 Simultaneous equation

Answer 1

$3x+y=9\\2x-y=11\\------\\5x-0=20\\\\5x=20\\x=\frac{20}{5}\\\\x=4$

Put this value in any equation to find 'y'

$3x+y=9\\y=9-3x\\y=9-3(4)\\y=9-12\\\\y=-3$