Gina sells standard ornaments for $10 and the deluxe ornaments for $15. if gina receives an order for 18 ornaments and charges $200, how many ornaments of each type were ordered?

First we set up 2 equations using the given info
let standard ornaments = s & deluxe ornaments = d



first we solve for one variable in our first equation


then we plug it into our second equation




now plug this back into our first equation



standard ornaments ordered = 14
deluxe ornaments ordered = 4