4x-4y= 1

3x+2y=2

Solution:

3x+2y=2 Multiply both sides by 2, that is 6x+4y=4.

Then 6x+4y=4.

4x-4y= 1

amount to

That is 6x+4y+4x-4y=5.

solve

x= 1/2

will

x= 1/2

Drag in

4x-4y= 1

middle

solve

y= 1/4

2

3x+3y=-4，

x+ 1/2y=2

Solution: x+ 1/2y=2.

Multiply both sides by 3, that is 3x+3/2y=6.

Then 3x+3y=-4.

3x+3/2y=6

minus

That is 3x+3y-3x-3/2y=- 10.

solve

y=-20/3

Y=-20/3

Drag in

3x+3y=-4

middle

solve

x= 16/3

three

X/3-y/4=3x+2y-75=3

Solution:

X/3-y/4=3, and both sides are multiplied by 8, that is, 8x/3-2y=24.

Then 3x+2y=78.

8x/3-2y=24

amount to

That is 3x+2y+8x/3-2y= 102.

solve

x= 18

Bring x= 18 into

X/3-y/4=3

middle

solve

y= 12