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x+y=3
(+)-------------------
5x=7
x= 7/5
x=1 2/5
1 2/5 + y=3
x=1 2/5
y=3 - 1 2/5
x=7/5
y=1 3/5
b) {3y-7x=-32
{2x-3y=7
3y-7x= -32
-3y+2x= 7
--------------------
-5x= -25
x=5
x=5
3y - 7*5= -32
x=5
3y - 35= -32
x=5
3y= -32+5
x=5
3y= -27
x=5
y= -9