SOLUTION: there are 15 pens and pencils in a jar. if there are 7 more pencils than pens, how many of each are in the jar?

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Question 1007211: there are 15 pens and pencils in a jar. if there are 7 more pencils than pens, how many of each are in the jar?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call the number of pens and pencils, x and y. Then we have
x + y = 15 and
y = x + 7
Now substitute the second equation into the first and get
x + x + 7 = 15
2x + 7 = 15
2x = 8
x = 4 pens
y = 11 pencils