SOLUTION: How do you solve..... I purchased 35 total pens. I purchased 4 times as many red ones than I did black ones. How do I write the equation that represents each color pen? r+b=35

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Question 724385: How do you solve..... I purchased 35 total pens. I purchased 4 times as many red ones than I did black ones. How do I write the equation that represents each color pen? r+b=35?
Found 2 solutions by Alan3354, josmiceli:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How do you solve..... I purchased 35 total pens. I purchased 4 times as many red ones than I did black ones. How do I write the equation that represents each color pen? r+b=35?
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r + b = 35
r = 4b
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Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I think I know what they're after.
given:
(1) +r+%2B+b+=+35+
(2) +r+=+4b+
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Equation for red pens:
(1) +b+=+35+-+r+
(2) +r+=+4%2A%2835+-+r%29+
+r+=+180+-+4r+
+5r+=+180+
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Equation for black pens
(1) +r+=+35+-+b+
(2) +35+-+b+=+4b+
+5b+=+35+
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