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2x+3y=1/*3
3x-2y=-5/*(-2)
6x+9y=3
-6x+4y=10
6x+9y-6x+4y=13
13y=13 /13
y=1
b)
5x+3y=0
1,5x+y=2
5x+3y=0 /*1
1,5x+y=2 /*(-3)
5x+3y=0
-4,5x-3y=-6
5x+3y-4,5x-3y=0-6
0,5x = -6 /0,5
x= -12
c) 1/2x +2y=4 /*1
-x+3y= -1 /* 1/2
1/2x+2y=4
-1/2x +1,5y= - 1/2
1/2x+2y-1/2x+1,5y= 4 - 1/2
3,5y=3,5 / 3,5
y=1