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3x-2y=0 |*2
6x+2y=21
6x-4y=0
-
0+6y=21
y=21/6
y=3 2/3
2x+3 2/3=7
2x=7- 3 2/3
2x=3 1/3 |/2
x=5/3
3x-2y=0
y=7-2x
3x-2y=0
y=7-2x
3x-2(7-2x)=0
3x-14+4x=0
7x=14 /:7
x=2
y=7-2*2
x=2
y=3
x=2
3x-2y=0
4x+2y=14
+ { 3x-2y=0
7x=14|:7
x=2
2*2+y=7
4+y=7
y=7-4
y=3
x=2