Question

а) х+у=11
2х-у=-5

б) 5х-4у=8
х-4=2

Answer 1

x+y=11
2x-y=-5

x=11-y
2(11-y)=-5
22-2y=-5
-2y=-5-22=-27
y=27/2=13.5
x+13.5=11
x=11-13.5=-2.5


5x-4y=8
x-4=2

x=2+4=6
5*6-4y=8
-4y=8-30=-22
y=22/4=5.5