the manager of a music store ordered 20 new violins. she ordered some of two different models- the standard and the deluxe. each standard violin costs $500, and each deluxe violin costs $800

if the manager spent exactly $11,500 on these violins how many deluxe violins did she order? show your work or explain how you know..

for my equation i set it up like this:
500s + 800d = 11,500
s + d = 20

not sure what to do next..

Question

the manager of a music store ordered 20 new violins. she ordered some of two different models- the standard and the deluxe. each standard violin costs $500, and each deluxe violin costs $800

if the manager spent exactly $11,500 on these violins how many deluxe violins did she order? show your work or explain how you know..

for my equation i set it up like this: 
500s + 800d = 11,500 
s + d = 20 

not sure what to do next..

anonymous · Answer

Rearrage the second equation for s = ... or d = ... then substitute it into the 1st equation :)

anonymous · Answer

then solve for that variable.  Once you have one, you can get the other

anonymous · Answer

Solve for the two equations by substitution:
500s + 800(20-s)=11500

anonymous · Answer

i think we have to use distribution

anonymous · Answer

You can solve it using this method and it's simple.

anonymous · Answer

answer=11500