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a)
y+2-(3-x)=0
x-2=5-(2-y)
y+2-3+x=0
x-2-5+2-y=0
x+y=1 ----->x=1-y
x-y=5
1-y-y=5
-2y=4
y=-2
x=1-(-2)
x=3
b)3x-3y+4x=8
3x-15y=5-9y
7x-3y=8 /*(-2)
3x-6y=5
-14x+6y=-16
3x-6y=5
_____________
-11x=-11
x=1
7*1-3y=8
-3y=8-7
-3y=1
y=-1/3
c)6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y=20
-5x-2y=4 /*2
6x+4y=20
-10x-4y=8
___________
-4x=28
x=-7
6*(-7)+4y=20
4y=62
y=15,5
d)2x+2y-3x+6y=-7x-2
5x+5-6+2y=-4x-4y
6x+8y=-2 /*(-9)
9x+6y=1 /*6
-54x-72y=18
54x+36y=6
__________
-36y=24
y=-2/3
6x+8*(-2/3)=-2
6x=-2+16/3
6x=-6/3+16/3
6x=10/3
x=5/9
e)
4x+8-3y+3-x-y=-3
3x-12-2y+4-4x+4y=4
3x-4y=-14
-x+2y=12 *3
3x-4y=-14
-3x+6y=36
__________
2y=22
y=11
3x-4/11=-14
3x=30
x=10
a) y + 2 - ( 3 - x) = 0
x - 2 = 5 - ( 2 - y)
y+2-3+x=0
x-2=5-2+y
x+y=-2+3
x-y=5-2+2
x+y=1
x-y=5
x=6
y=0
b) 3 ( x -y) + 4x = 8
3 ( x - 5y) = 5 - 9y
3x-3y+4x=8
3x-15y=5-9
7x-3y=8 /*3
3x-6y=5 /*(-7)
21x-9y=24
-21x+42y=-35
33y=-11
y=- 11/33
y=-1/3
7x-3y=8 /*(-2)
3x-6y=5
-14x+6y=-16
3x-6y=5
-11x=-11
x=1
c) 3 ( 2x - 1) + 4 ( y - 2 ) = 9
2 ( 5x - 1) + 3y = 5( 3x + y)+ 2
6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y=9+8+3
10x-15x-5y+3y=2+2
6x+4y=20 /*5
-5x-2y=4 /*6
30x+20y=100
-30x-12y=24
8y=124
y=15,5
6x+4y=20
-5x-2y=4 /*2
6x+4y=20
-10x-4y=8
-4x=24
x=-7
d) 2 ( x +y) - 3 ( x - 2y) = -7x - 2
5( x+1) -2 ( 3 - y) = -4 ( x+ y)
6x+8y=-2
9x+6y=1
-54x-72y=18
54x+36y=6
-36y=24
y=-2/3
6x+8y=-2
9x+6y=1
-18x-24y=-6
36x+24y=1
18x=-5x
x=-5/18