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y=x-3
y=-0,5x+3
y=x-3
x-3=-0,5x+3
y=x-3
x+0,5x=3+3
y=x-3
1,5x=9
y=x-3
x=6
y=6-3
x=6
y=3
x=6
c)
y=-2x+6
3x-2y=6
y=-2x+6
3x-2(-2x+6)=6
y=-2x+6
3x+4x-12=6
y=-2x+6
7x=18
y=-2x+6
x=18/7
y=-2*18/7+6
x=18/7
y=-36/7+6
x=18/7
y=-5¹/₇+6
x=18/7
y=⁶/₇
x=18/7
c)
-2x+y-6=0
-x+y-3=0|*(-1)
-2x+y-6=0
x-y+3=0
------------ +
-x-3=0
-x=3
x=-3
-2*(-3)+y-6=0
6+y-6=0
y=0