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2x+3y= -1
7x+4y= -2
1*2x=-1-3y = x=-1-3y/2
2*7x=-2-4y = x=-2-4y/7
1* x=x
-1-3y/2=-2-4y/7
7(-1-3y)=2(-2-4y)
-7-21y=-4-8y
-3=13y
-3/13=y
2x+3(-3/13)=-2
2x-9/13=2
-9-2x=26
-2x=35
x=-17,5 ó 35/-2