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2x-y=3
-2x-2y=-18
2x-y=3
-3y=-15/:(-3)
y=5
x+y=9
y=5
x=9-5
y=5
x=4
y=5
2x-y=3
----------
x=9-y
2x-y=3
---------
x=9-y
2(9-y)-y=3
----------
x=9-y
18-2y-y=3
---------
x=9-y
-3y=-15 /:(-3)
---------
x=9-y
y=5
---------
x=9-5
y=5
---------
x=4
y=5
2x-y=3
x=9-y
2*(9-y)-y=3
x=9-y
18-2y-y=3
x=9-y
18-3y=3
x=9-y
-3y=3-18
x=9-y
-3y=-15
x=9-y
y=5
x=9-5
y=5
x=4
y=5