Answered

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3x -4y= -20 -x +2y =10 whats the value of y

Sagot :

3x-4y=10
-20-x+2y=10 then -30+2y=x now plug this in the other equation:
3(-30+2y)-4y=10
-90+6y-4y=10
2y=100
y=50
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