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2x+3y=8......(-3)
3x+4y=17....(2)
~~~~~~~
-6+12y=-24
6x+8y=34
~~~~~~~~~
4y=68
y=68/4
y=17
2)
11x+13y=2..... (-2)
2x+4y=9.......(11)
~~~~~~~~~
-22x-26y=-4
22x+44y=99
~~~~~~~~~
18y=95
y=95/18
y=5,28(redondeado)
3)
17x+18y=-19.....(-29)
29x+30y=-31.....(17)
~~~~~~~~~~
493x-522y=551
493x+510y=-527
~~~~~~~~~~~~
12y=24
y=24/12
y=2