1. 2x+4y=18
2x+4y-18=0
x+2y-9=0
2. -4+2y=9
2y=9+4
2y=13
y=13/2
3. 100y+2x+5=0
100y+2x=-5
2x+100y=-5
4. 3y=3x+3
3y-3x=3
y-x=1
-x+y=1
x-y=-1
5. 5=3x-5y
3x-5y=5
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Answers & Comments
1. 2x+4y=18
2x+4y-18=0
x+2y-9=0
2. -4+2y=9
2y=9+4
2y=13
y=13/2
3. 100y+2x+5=0
100y+2x=-5
2x+100y=-5
4. 3y=3x+3
3y-3x=3
y-x=1
-x+y=1
x-y=-1
5. 5=3x-5y
3x-5y=5