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unicornsareawesome
unicornsareawesome unicornsareawesome
  • 20-08-2014
  • Mathematics
Answered

describe and correct the error in solving this equation

-2(7-y)+4=-4

-14-2y+4=-4

-10-2y=-4

-2y=6

y=-3


please show work I don't know how to get the answer

Verified Answer :

johnnyzhou2009
johnnyzhou2009 johnnyzhou2009
  • 20-08-2014

it's wrong because you multiplied wrong in the first step.

here's what went wrong,

-2(7-y)+4=-4
-14+2y+4=-4 <--- multiplying two negatives equals a positive.

Answer Link
jaig jaig
  • 20-08-2014

shouldn't it be
-2(7-y)+4=-4
-14+2y+4=-4
-10+2y=-4
2y=-14
y=-7
I think

Answer Link

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