Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7 of them how many of each kind did she buy?
assume Kristin bought x fancy shirts and y plain shirts:
from 1: x=7-y 3
plug 3 into 2: 28(7-y)+15y=131
Thus Kristin will buy 5 fancy shirts and 2 plain shirts.
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