Question

Please help for number 25

Answer 1

The correct answer is:  [C]:  " inverse variation;  xy = 40 " .
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Explanation:
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Examine the table given, and plug in the value:
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In the equation for Answer choice: [C]:  " xy = 40 ".

When x = 1 , y = 40.

xy = 40 ;  1*40 = 40.  Yes.

When x = 2, y = 20.

xy = 40;  2*20 = 40.  Yes. 

When x = 5, y = 40.

xy = 40.  8* 5 = 40.  Yes.

When x = 10, y = 4.

xy = 40.  10*4 = 40. Yes.
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So the equation makes sense ;
 
"inverse variation;  xy = 40".
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since; "xy = 40" ; which is "answer choice: [C]".
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     We know that the other choices do NOT make sense; if we plug in any of the corresponding x and y values for any of the equations provided in any of the other answer choices, the equations will not equal, and as such, the answer choices are incorrect.
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