X+2y=1 and 2x+3y=12
Solve by elimination method
( do it fast )
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x+2y=1 →equation 1 →(×2)
2x+3y=12 →equation 2→ (×1)
_________
2x+4y=2
2x+3y=12
(-) (-) (-)
___________
y=-10
substitute y=-10 in equation 1
x+2(-10)=1
x-20=1
x=1+20
x=21
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