Question 182546
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? 

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Put the numbers in place of the letters.

3*2 - 4*5 + 9

6 - 20 + 9
15 - 20
-5
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Cheers,
Stan H.