2x - y = 24
x + y = 30
x=30-y
2(30-y) - y = 24
60-2y-y=24
60-3y=24
-3y=24-60
-3y=-36 .(-1)
3y=36
y=36/3
y=12
x+12=30
x=30-12
x=18
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2x - y = 24
x + y = 30
x=30-y
2(30-y) - y = 24
60-2y-y=24
60-3y=24
-3y=24-60
-3y=-36 .(-1)
3y=36
y=36/3
y=12
x+12=30
x=30-12
x=18