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4x+3y=13
6x-5y=-9 (3)
4x+3y=13 (5)
18x-15y=-27
20x+15y=65
___________
38x=38
x=1
6(1)-5y=-9
6+9=5y
15/5=y
y=3
2.
7x-15y=1
-x-6y=8
7x-15y=1
-x-6y=8 (7)
7x-15y=1
-7x-42y=56
__________
-57y=57
y=-1
7x-15(-1)=1
7x+15=1
7x=1-15
x=-14/7
x=-2
Y asi se hacen los demás...........saludos :)