Question 379688
Creative   Mart sells paint supplies at discount prices.
 On a particular day they sold 238 paint roller covers.
 some of these were 7' rollers, which sold for $1.97 each, 
while the rest were for 9' rollers, which sold for $2.29 each.
 how many types of rollers where sold if the sales totaled 518.78.
:
You can write two equations from the givien information
Let x = 7' rollers
Let y = 9' rollers
:
Total item equation
x + y = 238
y = (238-x); use this for substitution in the 2nd equation
:
1.97x + 2.29y = 518.78