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y+x=7
3y=x+9
x+y=7
-x+3y=9
x+y=7
------------
3y+y=9+7
4y=16/:4
y=4
x+y=7
x+4=7
x=7-4
x=3
x=3
y=4
===================
y-3x+4=0
4=x
y-3*4+4=0
4=x
y-12+4=0
4=x
y=12-4
x=4
y=8
x=4
=====================
2x-3y=6
-4/3+2y= -4
2x-3y=6
2y= -4 +4/3
2x-3y=6
2y= -4+1 1/3
2x-3y=6
2y= -2 2/3/:2
2x-3y=6
y=-8/3 * 1/2
2x-3y=6
y= -8/6
2x-3y=6
y= -4/3
2x-3*(-4/3)=6
y= -4/3
2x+12/3=6
y= -4/3
2x+4=6
y= -4/3
2x=6-4
y= -4/3
2x=2/:2
y= -4/3
x=1
y= -4/3
================
y-2x=4
1-y=0
y-2x=4
-y=-1/*(-1)
y-2x=4
y=1
1-2x=4
y=1
-2x=4-1
y=1
-2x=3/:(-2)
y=1
x=-3/2
y=1
x= -1,5
y=1
===============
3y+x=9
y+3= -1/3/*3
x+3y=9
3y+9= -3/3
x+3y=9
3y= -1-9
x+3y=9
3y= -10/:3
x+3y=9
y= -10/3
x+3*(-10/3)=9
y= -10/3
x-10=9
y= -10/3
x=9+10
y= -3 1/3
x=19
y= -3 1/3