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I need help with my math homework?

+2 votes
-3/4(4c-4)+7/8c=31 I keep coming up with 2 for my answers . can someone help me
asked Feb 16, 2013 in PRE-ALGEBRA by andrew Scholar

1 Answer

+2 votes

(-3/4)(4c - 4) + (7/8)c = 31

Take out common term 4.

(-3/4)4(c - 1) + (7/8)c = 31

-3(c - 1) + (7/8)c = 31

Distribute terms using distributive property:  a( b + c) = ab + ac

-3c + 3 + 7c/8 = 31

The LCD of 1, 1, 8 is 8

[-24c + 24 + 7c]/8 = 31

Multiply each side by 8.

[24 - 17c] = 31(8)

24 - 17c = 248

Subtract 24 from each side.

-17c = 224

Divide each side by -17.

c = - 224/17.

answered Feb 18, 2013 by britally Apprentice

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