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Algebra/variables on both sides

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Expert: - 11/20/2009


Question
4(y+1)= 7(y-2) I don't get theses at all

Answer
The parenthises mean to multiply what is on the outside by each element in the indside.

Thus, our equation becomes 4y + 4 = 7y - 14.

Subtracting -7y from both sides to put the y's on the left gives 4y-7y=-3y and 7y-7y=0,
so we now have -3y + 4 = -14.

Subtracting 4 from both sides gives 4-4=0 and -14-4=-18, so we now have -3y = -18.

Dividing both sides by -3 gives y = -18/-3 = 18/3 = 6.

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