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2x+3y=-1 >1
9x-3y=-21
2x+3y=-1
ditambah
11x=-22
x=-2
2x+3y=-1
2(-2)+3y=-1
-4+3y=-1
3y=-1+4
3y=3
y=1
2x+3y=-1 (x3)= 3x+11/7=-7
3x=-7-11/7
6x-2y=-14 3x= -49/7-11/7
6x+9y=-3_ 3x=-60/7
x= -60/7:3
7y=-11 x=-60/7x1/3
y=-11/7 x=-60/21