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5x-y=4 *2
3x+2y=1
10x-2=12
13x=13 /13
x=1
3*1+2y=1
2y=1-3
2y=-2 /2
y=-1
b
x+3y=7*-2
2x+y=4
-2x-6y=-14
2x+y=4
5y=-10/5
y=-2
2x-2=4
2x=2/2
x=1
c
2x+y=4 *2
x-2y=7
4x+2y=8
x-2y=7
5x=15 /5
x=3
3-2y=7
-2y=4 /-2
y=2
d
7x-3y=15 *2
5x+6y=27
14x-6y=30
5x+6y=27
19=3 / 19
f 3x+5y=4 *3
7x-3y=2 *5
9x+15=12
35x-15y=10
44x=22 /44
x=0,5
3*0,5+5y=4
1,5+5y=4
5y=2,5 /5
y=0,5