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x-2y= -1/*(-1)
x+y=5
-x+2y=1
------------
3y=6/:3 y=2
x+y=5
x+2=5
x=5-2
x=3
y=2
x=3
b)y-x=4
3(x+y)=24
y-x=4
3x+3y=24
x-y=4/*3
3x-3y=24
3x-3y=12
3x-3y=24
--------------------
-6y=36/:(-6)
y=(-6)
x-y=4
x-(-6)=4
x+6=4
x=4-6
x=(-2)
x-2y = -1
x=5-y
5-y-2y=-1
-3y=-6
y=2
x+2=5
x=3
--------------------
y-x=4
3x+3y=24
3x+12+3x=24
6x=12
x=2
y-2=4
x=2
y=6