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d)
2(x+y)-3(x-2y)=-7x-2
5(x+1)-2(3-y)=-4(x+y)
2x+2y-3x+6y=-7x-2
5x+5-6+2y=-4x-4y
6x+8y=-2 /*(-1,5)
9x+6y=1
-9x-12y=3
9x+6y=1
-----------
-6y=4
y=-2/3
9x+6(-2/3)=1
9x-4=1
9x=5
x=5/9
e)
4(x+2)-3(y-1)=x+y-3
3(x-4)-2(y-2)=4(x-y)+4
4x+8-3y+3=x+y-3
3x-12-2y+4=4x-4y+4
3x-4y=-14
-x+2y=12 /*(2)
3x-4y=-14
-2x+4y=24
------------
x=10
y=11
2(x+y)-3(x-2y)=-7x-2
5(x+1)-2(3-y)=-4(x+y)
2x+2y-3x+6y = -7x-2
5x+5-6+2y = -4x-4y
2x-3x+7x+2y+6y = -2
5x+4x+2y+4y = 1
6x+8y = -2 |*3
9x+6y = 1 |*(-2)
18x+24y = -6
-18x-12y = -2
-------------------
24y-12y = -6-2
12y = -8 |:12
y = -8/12
y = -2/3
18x+24y = -6
18x+24*(-2/3) = -6
18x-16 = -6
18x = -6+16
18x = 10 |:18
x = 10/18
x = 5/9
x = 5/9
y = -2/3
e)
4(x+2)-3(y-1)=x+y-3
3(x-4)-2(y-2)=4(x-y)+4
4x+8-3y+3 = x+y-3
3x-12-2y+4 = 4x-4y+4
4x-x-3y-y = -3-3-8
3x-4x-2y+4y = 4-4+12
3x-4y = -14
-x+2y = 12 |*3
3x-4y = -14
-3x+6y = 36
----------------
-4y+6y = -14+36
2y = 22 |:2
y = 11
-x+2y = 12
-x+2*11 = 12
-x = 12-22
-x = -10 |*(-1)
x = 10
x = 10
y = 11