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x-4y=3/*(-3)
3x-2y=-5
-3x+12y=-9
10y=-14/:10
y=-10/14
3x-2y=-5/*-2
x-4y=3
-6x+4y=10
x-4y=3
5x=13/:5
x=5/13
x+ 3y =6 /*-2
2x+ 6y = 8
-2x-3y=-12
2x+ 6y = 8
3y=-4/:3
y=-3/4
x+ 3y =6 /*-2
2x+ 6y = 8
-3x-6y=-12
2x+ 6y = 8
-x=-4/*-1
x=4
3x-2y = -5
x-4y=3 |*(-3)
3x-2y = -5
-3x-12y=-9
-14y=-14 |(:-14)
y=1
3x - 2*1 = -5
3x - 2 = -5
3x = -5 + 2
3x = -3 |: 3
x = -1
x = -1
y = 1
b)
x+ 3y =6 |*(-2)
2x+ 6y = 8
-2x -6y = -12
2x + 6y = 8
0=-4
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