David bought 3 dvds for for books for $40 at a yard sale in about one dvd and six books for $18 how much did each dvd cost
David bought 3 dvds for for books for $40 at a yard sale in about one dvd and six books for $18 how much did each dvd cost
The system:3 x + 4 y = 40x + 6 y = 18,-------------------x = 18 - 6 y3 ( 18 - 6 y ) + 4 y = 4054 - 18 y + 4 y = 4054 - 40 = 18 y - 4 y14 = 14 yy = $1x = 18 - 6x = $12Answer: Each DVD costs:$12....
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