9x +3y= -12
18x+24= -6y
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Step-by-step explanation:
9x+3y= -12 ---------------->1
18x+24= -6y -------------->2
18x+6y= -24 --------------->3
subtracting equation 2 to 3
18x+24= -6y ------------>2
- 18x+6y= -24 ------------>3
- - -
____________
=-12
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