SOLUTION: The sum of two numbers is 42. One number plus 2 times the other number is 57. What are the numbers? Thank you!

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Question 103920This question is from textbook Plato Interactive Mathematics
: The sum of two numbers is 42. One number plus 2 times the other number is 57. What are the numbers? Thank you! This question is from textbook Plato Interactive Mathematics

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=42 OR X=42-Y
X+2Y=57 NOW SUBSTITUTE (42-Y) FOR X & SOLVE FOR Y
(42-Y)+2Y=57
42-Y+2Y=57
Y=57-42
Y=15 ANSWER.
X=42-15
X=27 ANSWER.
PROOF
27+2*15=57
27+30=57
57=57