Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 151658This question is from textbook elementary and intermediate algebra concepts and applications
: Can somebody help me please?
7. If P = 3y + 7xy - 2x and Q = 9 - 2y, find the value of 3P - 4QThis question is from textbook elementary and intermediate algebra concepts and applications
: Can somebody help me please?
7. If P = 3y + 7xy - 2x and Q = 9 - 2y, find the value of 3P - 4Q
Answer by jim_thompson5910(9376) About Me  (Show Source):
You can put this solution on YOUR website!
3P - 4Q Start with the given expression.


3(3y + 7xy - 2x) - 4(9 - 2y) Plug in P = 3y + 7xy - 2x. Plug in Q = 9 - 2y


9y + 21xy - 6x - 36 +8y Distribute


-6x + 21xy+17y - 36 Combine like terms.


So 3P - 4Q=-6x + 21xy+17y - 36