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x-y=1/*(-2)
2x+4y=35
-2x+2y=-2
----------
6y=33
y=33/6
y=5,5
x-5,5=1
x=6,5
b) 13x+5y=1
x+2y=0/*(-13)
13x+5y=1
-13x-26y=0
----------------
-21y=1/;(-21)
y=-1/21
x+2*(-1/21)=0
x=2/21
C)
x-y=2/*(-3)
3x-2y=9
-3x+3y=-6
3x-2y=9
--------------
y=3
x-3=2
x=2+3
x=5
y=3
D)
x-2y=3
5x+y=4/(2)
x-2y=3
10x+2y=8
-------------
11x=11
x=1
1-2y=3
-2y=3-1
-2y=-2
y=1
x=1
E)
x+5y=7/*(-3)
3x-2y=4
-3x-15y=-21
3x-2y=4
----------------
-17y=-17
y=1
x+5*1=7
x+5=7
x=2
y=1
F)
x-2y=9
2x+y=2/*2
x-2y=9
4x+2y=4
---------------
5x=13
x=13/5
2*13/5+y=2
y=2-26/5
y=10/5-26/5
y=-16/5
y=-3 i 1/5
x=2 i3/5