College algebra 2

Oct 2008
8
0
Mary has $750.00 in 10 and 25 dollar coins. If she has twice as many 10 dollar coins as 25 dollar coins. What's the number of 10 dollar coins she has?
 
Jun 2008
16,216
6,764
North Texas
x = number of $10 coins

y = number of $25 coins

Mary has $750.00 in 10 and 25 dollar coins
10x + 25y = 750

she has twice as many 10 dollar coins as 25 dollar coins
2y = x

solve the system of equations using a method you were taught.
 
  • Like
Reactions: Michelle Belford