n + d = 16 ------> n = 16 - d
5n + 10d = 135
Substitute.
5(16 - d) + 10d = 135
Solve for d, then substitute your answer in for d in the first equation and solve for n.
David W.
tutor
If further assistance is needed on the algebra, I will give it when requested.
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02/08/18
David W.
Uh ... the previous (rare) comment was a request ("Would you"); and I even wrote "PLZ."
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02/08/18
John R.
Thank you for this David W.. I only have one question, in the original equation n + d = 16. Why is the "answer" 16.
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02/15/18
David W.
tutor
16 nickles (n) and dimes (d).
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02/15/18
David W.
02/08/18