Answer:
1. 8x-4y=20
> 8x-4y=20
> 4y=8x-20
> 4y/4=8x/4-20/4
> y=2x-5
2. 2x+3y=12
> 3y=-2x+12
> 3y/3=-2x/3+12/3
> y=-2/3x+4
3. 2x+y=-11
> 2x+y=-11
> y=-2x-11
4. 3y=4x-27
> 3y/3=4x/3-27/3
> y=4/3x-9
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Answers & Comments
Answer:
1. 8x-4y=20
> 8x-4y=20
> 4y=8x-20
> 4y/4=8x/4-20/4
> y=2x-5
2. 2x+3y=12
> 3y=-2x+12
> 3y/3=-2x/3+12/3
> y=-2/3x+4
3. 2x+y=-11
> 2x+y=-11
> y=-2x-11
4. 3y=4x-27
> 3y/3=4x/3-27/3
> y=4/3x-9