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2x-y-3=0
x+3y=12
2x-y=3 /*3
x+3y=12
6x-3y=9
7x=21 /:7
x=3
3+3y=12
3y=9 /:3
y=3
x=3
---------------------
2x-y-5=0
3x=y-6
2x-y=5 /*-3
3x-y=-6 /*2
-6x+3y=-15
6x-2y=-12
y=-3
3x+3=-6
3x=-3
x=-1
y=-3
--------------------------
x+4y-14=0
3x-y=20
x+4y=14
3x-y=20 /*4
x+4y=14
12x-4y=80
13x=94
x=7,23
21,69-y=20
y=-1,69
y=-1,69
x=7,23
2x-y-3=0
x+3y=12
2x-y=3
-2x-6y=-24
2x-y=3
-7y=-21
y=3
x+3y=12
x+9=12
x=3
b)2x-y-5=0
3x=y-6
2x-y=5
3x-y=-6
-2x+y=-5
3x-y=-6
x=-11
3x=y-6
-33=y-6
-y=27
y=-27
c)x+4y-14=0
3x-y=20
x+4y=14
3x-y=20
-3x-12y=-42
3x-y=20
-13y=-22
y=22/13
3x-y=20
3x-22/13=20
3x=20+22/13
3x=282/13
x=282/39