Gabriella but nine shirts for a total of $90 T-shirts cost eight dollars and long sleeves cost $14 how many of each type of shirt did she buy
L = long sleeve cost of long sleeves = $ 14 L
T = T shirt = 9- L cost of T's = $ 8 (9-L) The red equations added together = $ 90
14L + 8 (9-L) = 90 solve for 'L' the long sleeves, then T's = 9-L