6y-2x=9
3y=x-6
-x=-3y-6/-1
x=3y+6
3y=3y+6-6
3y-3y=0
y=0
x=3*0+6
x=6
b) 2y=x
x-1/2=0
x=0+1/2
x=1/2
2y=1/2/2
y=1/2:2
y=1/2*1/2
y= 1/4
c)2y+x=3
y-1,5= -0,5x
x=3-2y
y-1,5= -0,5*9(3-2y)
y-1,5= -0,5*27-18y
y-1,5= -13,5-18y
y+18y=-13,5+1,5
19y=-12/19
y= - 12/19
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6y-2x=9
3y=x-6
6y-2x=9
-x=-3y-6/-1
x=3y+6
3y=3y+6-6
3y-3y=0
y=0
x=3y+6
x=3*0+6
x=6
b) 2y=x
x-1/2=0
x=0+1/2
x=1/2
2y=1/2/2
y=1/2:2
y=1/2*1/2
y= 1/4
c)2y+x=3
y-1,5= -0,5x
x=3-2y
y-1,5= -0,5*9(3-2y)
y-1,5= -0,5*27-18y
y-1,5= -13,5-18y
y+18y=-13,5+1,5
19y=-12/19
y= - 12/19