SOLUTION: Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7 then how many of each kind did she buy? How would you go about solvin

Question 572262: Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7 then how many of each kind did she buy?
How would you go about solving this problem? My step-daughter has it on her homework and she is having me check her work and it has been 20 years since I took algebra and I am at a lose as to where to even begin this problem.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
"Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15" ___ 28f + 15p = 131

"she bought a total of 7" ___ f + p = 7 ___ p = 7 - f

substituting the equivalent value of p ___ 28f + 15(7 - f) = 131

28f + 105 - 15f = 131 ___ 13f = 26

solve for f , then substitute back to find p
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