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a){x-2y=3
{4x-3y=2
x=3+2y
4(3+2y)-3y=2
x=3+2y
12+8y-3y=2
x=3+2y
5y=-10 /:5
x=3+2y
y=-2
x=3-4
y=-2
x=-1
y=-2
b){½x-⅔y=4 /*6
{1½x+y=3 /*2
3x-4y=24
3x+2y=6
3x=24+4y
24+4y+2y=6
3x=24+4y
6y=-18 /:6
3x=24+4y
y=-3
3x=24+4y
y=-3
3x=24-12
y=-3
3x=12 /:3
y=-3
x=4
y=-3
c){3x+2y=-7 /*2
{-2x+3y=9 /*3
6x+4y=-14
-6x+6y=27
6x=-14-4y
-(-14-4y)+6y=27
6x=-14-4y
14+4y+6y=27
6x=-14-4y
10y=13 /:10
6x=-14-4y
y=1,3
6x=-14-5,2
y=1,3
6x=-19,2 /:6
y=1,3
x=3,2
y=1,3
d){2x-4y=20
{⅓x+1/9y=2/9 /*9
2x-4y=20
3x+y=2
2x-4y=20
-y=2-3x /*(-1)
2x-4y=20
y=-2+3x
2x-4(-2+3x)=20
y=-2+3x
2x+8-12x=20
y=-2+3x
-10x=12 /:(-10)
y=-2+3x
x=-1,2
y=-2-3,6
x=-1,2
y=-5,6
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