SOLUTION: Hi, I really need some help with the following: If P = 3y + 7xy - 2x and Q = 9 - 2y, find the value of 3P - 4Q.

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Question 151636: Hi,
I really need some help with the following:
If P = 3y + 7xy - 2x and Q = 9 - 2y, find the value of 3P - 4Q.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
3P+-+4Q Start with the given expression.


3%283y+%2B+7xy+-+2x%29+-+4%289+-+2y%29 Plug in P = 3y + 7xy - 2x. Plug in Q = 9 - 2y


9y+%2B+21xy+-+6x+-+36+%2B8y Distribute


-6x+%2B+21xy%2B17y+-+36 Combine like terms.


So 3P+-+4Q=-6x+%2B+21xy%2B17y+-+36