A coin bank contains 250 coins, all dimes and quarters. Together the coins total $39.95. How many quarters are in the coin bank? How many dimes are in the coin bank?
I do know i have to use the numbers in an equation, making quarters X and dimes Y. I think I set it up like this...
x+y = 39.25 and
x+y= 250....i think idk :) Help me please

Question

A coin bank contains 250 coins, all dimes and quarters. Together the coins total $39.95. How many quarters are in the coin bank? How many dimes are in the coin bank? 
I do know i have to use the numbers in an equation, making quarters X and dimes Y. I think I set it up like this...
x+y = 39.25 and
x+y= 250....i think idk :) Help me please <3

anonymous · Answer

Second equation is right, but for the first one its cost...a quarter is .25 and dime is .10

.25x+.10y=39.25

anonymous · Answer

so would i graph, substitute, or do combination???

anonymous · Answer

Any, but substitution would probably be easiest. You can solve for y in the second equation easy

y=250-x

and plug that into the other

anonymous · Answer

the do i plug y into the first equation?

anonymous · Answer

@CalebBeavers

anonymous · Answer

Yep so youve got

.25x+.10(250-x)=39.25

now can you solve for x?

anonymous · Answer

yeah thanks :)

anonymous · Answer

Yeah i just noticed it only wants the number of dimes, so once you have x which is the number of quarters just plug it into x+y=250 to get number of dimes

anonymous · Answer

okay will do :) thanks again!! lol