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a)3x+3y=6
2x+y=10/-2x
3x+3y=6
y=10-2x
3x+3(10-2x)=6
y=10-2x
3x+30-6x=6
y=10-2x
-3x+30=6/-30
y=10-2x
-3x=-24/:(-3)
y=10-2x
x=8
y=10-2*8
x=8
y=10-16
x=8
y=-6
b)4x-2y=10/:2
2x+2y=6
2x-y=5/-2x
2x+2y=6
-y=6-2x
2x+2y=6
-y=6-2x
2x+2(-6-2x)=6
-y=6-2x
2x-12-4x=6
-y=6-2x
-2x-12=6/+12
-y=6-2x
-2x=18/:(-2)
-y=6-2x
x=-9
-y=6-2*(-9)
x=-9
-y=6-(-18)
x=-9
-y=24/*(-1)
x=-9
y=-24
c)4x=6-4y
2x+3=y
4x=6-4y
y=2x+3
4x=6-4(2x+3)
y=2x+3
4x=6-8x-12
y=2x+3
4x=-8x-6/+8x
y=2x+3
12x=-6/:12
y=2x+3
x=-2
y=2*-2+3
x=-2
y=-1