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Zigmanuir [339]
3 years ago
8

David bought three DVDs and four books for $40 at a yard sale. Anna bought one DVD and six books for $18. how much did each DVD

and book cost ?
Mathematics
1 answer:
Dvinal [7]3 years ago
5 0

Answer: Anna bought 1 DVD and 6 books for $18. How much did each DVD and book cost? ... Your equations (2 unknowns and two equations, d is for a DVD and b is ... For Anna: d+6b=18 ... Combined equation: −14b=−14 and b=1 (means that each book worths $1). Now for DVD price,

Step-by-step explanation:

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Step-by-step explanation:

Assuming that what you want is the value of y, you can pass all the right side stuff to the left, and the y to the right:

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then  you can pass the 6 that is multiplying on the right to the left - now dividing:

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