SOLUTION: I just need a refresher. . Explain how we evaluate an algebraic expression for given values of the variables. How would we evaluate the expression "3x - 4y + 9" when x

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Question 151206This question is from textbook elementary and intermediate algebra concepts and applications
: I just need a refresher.

. Explain how we evaluate an algebraic expression for given values of the variables. How would we evaluate the expression "3x - 4y + 9" when x = 2 and y = 5?
This question is from textbook elementary and intermediate algebra concepts and applications

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
3%2Ax-4%2Ay%2B9 Start with the given expression.


3%2A2-4%2A5%2B9 Plug in x=2 and y=5


6-4%2A5%2B9 Multiply 3 and 2 to get 6.


6-20%2B9 Multiply 4 and 5 to get 20.


-14%2B9 Subtract 20 from 6 to get -14.


-5 Add -14 and 9 to get -5.


So 3%2Ax-4%2Ay%2B9=-5 when x=2 and y=5