SOLUTION: If Derek has 2 times as many nickels as quarters and they have a combined value of 280 cents, how many of each coin does he have?

Question 924456: If Derek has 2 times as many nickels as quarters and they have a combined value of 280 cents, how many of each coin does he have?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = nickels
y = quarters
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x = 2y
5x + 25y = 280
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put the system of linear equations into standard form
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x - 2y = 0
5x + 25y = 280
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = nickels = 16
y = quarters = 8
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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