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3 years ago

Each notebook in a store costs $7

Mathematics

1 answer:

gogolik [260]3 years ago

6 0

7x + 2y = 27

I can't read what the variables are in the picture, so I used x and y. But replace the variable 'x' with whatever the question says to use for notebooks, and change y to be whatever it says for the second thing in the store.

What my equation means is that an unknown number of notebooks, which is 7$ each, plus the other thing, which is $2 each, comes to a sum of $27.

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dlinn [17]

Answer:

The weight of container C is 2.1kg.

Step-by-step explanation:

This question is solved using a system of equations.

I am going to say that:

x is the weight of container A.

y is the weight of container B.

z is the weight of container C.

The average weight of 3 containers A,B and C is 3.2kg.

This means that the total weight is 3*3.2 = 9.6kg. So

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Container A is twice as heavy as container B.

This means that $x = 2y$ .

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400g is 0.4kg. So

This means that $y = z + 0.4$ , or $z = y - 0.4$

Replacing y and z as functions of x in the first equation:

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$y = \frac{10}{4} = 2.5$

Container C

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The weight of container C is 2.1kg.

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Answer:

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