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x-2=5-(2-y)
y+2-3+x=0
x-2=5-2+y
y+x=1
-y+x=3 +
----------------
2x=4
x=2
y+2=1
y=-1
b) 3(x-y)+4x=8
3(x-5y)=5-9y(tu zrobiles blad pewnie chodzilo o 3(x-5y)=5-9y a nie o 3(x-5y)=5=9y)
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
3*1-6y=5
-6y=2
y=-1/3
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=20
-5x-2y=4/*2
6x+4y=20
-10x-4y=8 +
-----------------
-4x=28
x=-7
6*(-7)+4y=20
-42+4y=20
4y=62
y=15.5
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
9x+6y=1/*(-⅔)
6x+8y=-2
-6x-4y=-⅔ +
--------------------
4y=-2⅔
4y=-8/3
y=-8/3*1/4
y=-⅔
6x=10/3
x=5/9
e) 4(x+2) -3(y-1)=x+y-3
powinienes tu dokonczyc cale 2 rownanie przykro mi nie rozwiaze go;/