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d)4x + 5y = -4 /*3
6x + 7y = -6 /*(-2)
12x+15y=-12
-12x-14y=12
___________
y=0
4x+0=-4
x=-1
e) 2x - 11y = 73 / *3
3x - 4y = 47 / *(-2)
6x-33y=219
-6x+8y=-94
__________
-25y=125
y=-5
2x-11*(-5)=73
2x+55=73
2x=18
x=9
f) -2x + 5y = -10 /*7
7x - 4y = 8 / *2
-14x+35y=-70
14x-8y=16
_________
27y=-54
y=2
-2x+5*2=-10
-2x+10=-10
-2x=-20
x=10
g) 9x + 8y = 1 / * (-5)
5x - 6y = 11 / 8*9
-45x-40y=-5
45x-54y=99
__________
-94y=-94
y=1
9x+8=1
9x=-7
x=-7/9