SOLUTION: 10. Marcos had 15 coins in nickels and quarters. He had 3 more quarters than nickels. He wrote a system of equations to represent this situation, letting x represent the number o

Question 857916: 10. Marcos had 15 coins in nickels and quarters. He had 3 more quarters than nickels. He
wrote a system of equations to represent this situation, letting x represent the number of
nickels and y represent the number of quarters. Then he solved the system by graphing.
What is the solution?

Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
Y + X = 15 [Marcos had 15 coins in nickels and quarters.]
Y = X + 3 [He had 3 more quarters than nickels.]
Substitute the value of X in the second equation into the first.
(X+3) + X = 15
2X + 3 = 15
2X = 12
X = 6
.
If X is 6, then Y is 9.
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