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Juliette [100K]
3 years ago
14

I don't get this I really need help to understand this "/

Mathematics
1 answer:
Alisiya [41]3 years ago
4 0
I don't either it is quite hard to be fair
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David bought 3 dvds and 4 books for $40 at a yard sale. Anna bought 1 dvd and 6 books for $18. How much did each dvd and book co
Ber [7]

Answer:

A book is worth $1 and a DVD is worth $12.

Step-by-step explanation:

The equations (2 unknowns and two equations, d is for a DVD and b is for a book):

For David: 3d+4b=40

For Anna: d+6b=18

Now multiply the second equation with -3 and add to the first equation:

3d+4b=40

−3d−18b=−54

Combined equation: −14b=−14 and b=1 (means that each book is worth $1).

 

Now for DVD price, use the second equation:

d=18−6 or d=12 (means that each DVD  is worth $12).

A book is worth $1 and a DVD is worth $12.

8 0
3 years ago
Someone please help me will give BRAILIEST!!!!!!
rewona [7]
The answer is true plz thnk me
4 0
3 years ago
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The data below are the number of absences and the final grades of 9 randomly selected students from a literature class. find the
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I don't know. I apologize. 
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3 years ago
The scale of this map is 1 inch = 50 miles. How many miles is Mackinac Bridge from Milwaukee? The distance on the map between th
amid [387]

Answer: 200 is the answer hope this helps

Step-by-step explanation:

8 0
3 years ago
2. 3х - бу = 18<br> 4.<br> How do you solve for y
Gnoma [55]

Answer:

y =  - 3 +  \frac{1}{2} xxer

Step-by-step explanation:

move variable to the right-hand side and change its sign

- 6y = 18 - 3x

divide both sides of the equation

y = 3 +  \frac{1}{2} x

8 0
2 years ago
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