3 years ago

Y=-2x+4complete the missing value in the solution to the equation

Mathematics

1 answer:

Kisachek [45]3 years ago

5 0

Im not sure but I think it’s Y/2-2 (the y and 2 is a fraction)

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3 years ago

Marco purchased a large box of comic books for $300. He gave 15 of the comic books to his brother and then sold the rest on an i

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Answer: There are 75 books.

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Let x = Number of books in the box.

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Selling price of one book = $\$(\dfrac{330}{x-15})$

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$\Rightarrow 1.50=\dfrac{330}{x-15}-\dfrac{300}{x}\\\\\Rightarrow\ 1.50=\dfrac{330(x)-300(x-15)}{x(x-15)}\\\\\Rightarrow\ 1.50=\dfrac{330x-300x+4500}{x^2-15x}\\\\\Rightarrow\ 1.50(x^2-15x)=30x+4500\\\\\Rightarrow\ 1.50x^2-22.5x=30x+4500\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ x^2-25x-3000=0\ \ [\text{divide by 1.5}]$

$\Rightarrow (x+40)(x-75)=0\\\\\Rightarrow\ x=-40,75$

Number of books cannot be negative.

So, there are 75 books.

Price of each book = $\dfrac{300}{75}=\$4$

So price of each book = $4.

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3 years ago

Y=-2x+4complete the missing value in the solution to the equation ​

Y=-2x+4complete the missing value in the solution to the equation