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Elena-2011 [213]
3 years ago
8

A used bookstore will trade 2 of its books for 3 of yours. If Val brings in 18 books to trade, How many books can she get from t

he store?
Mathematics
2 answers:
dolphi86 [110]3 years ago
8 0

Answer:

She will get 12 books from the store

Step-by-step explanation:

We can use ratio's to solve

2 books out      x books out

------------------- =-----------------------------

3 books in          18 books in from Val


Using cross products

2 * 18 = 3 *x

Divide each side by 3

2*18 /3 = 3x/3

2*6 = x

12 =x

She will get 12 books from the store

Molodets [167]3 years ago
6 0

Answer:

12 from the bookstore

Step-by-step explanation:

3 of yours ↔ 2 from the bookstore

18 of yours ↔ 12 from the bookstore


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Y_Kistochka [10]
The answer is:  [B]:  " x  + 3y + 10 = 0 " .
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Explanation:
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Note the equation for a line; in 'slope-intercept form':  "y = mx + b" ;
 
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                "m" = the slope of the line; and is the co-efficient of "x" ;
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So, given the information in this very question/problem:
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slope = m = (-1/3) ; 
b = y-intercept = (10/3) ; 
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And we can write the equation of the line; in "slope-intercept form"; that is:
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  " y = mx + b " ;  as:
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   " y = (-1/3)x + (10/3) " ;
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Now, the problem asks for the equation of this line; in "general form";  or "standard format";  which is:
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   "Ax + By + C = 0 " ; 
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So; given: 
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 " y = (-1/3)x + (10/3) " ;
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  We can multiply the ENTIRE EQUATION (both sides) by "3" ; to get rid of the "fractions" ;

  →  3* { y = (-1/3)x + (10/3) } ;

  →  3y = -1x + 10 ; 

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            -1x + 10 − 3y = 3y − 3y ;

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↔  -1x − 3y − 10 = 0 ;  

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     -1 * {-1x − 3y − 10 = 0} ; 

to get:
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   →   " x + 3y + 10 = 0 " ;  which is:  "Answer choice:  [B] ."
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