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Suppose y varies directly with x, an y = 14. When x= -4.what is the value of y when x=-6?"

A: -21

B: 10

C: 18

D: 21

 Nov 25, 2014

Best Answer 

 #1
avatar
+10

Saying that y varies directly with x is written mathematically as

 

y = k.x

 

where k is some constant.

 

Using the data values you are given, we can write   14 = k.(-4)

and re-arranging to make k the subject of the formula, we have

determined that k has the value -3.5

 

So the formula in this exercise is now knwn to be y = (-3.5)x

 

So we have now determined that the formula in this exercise is 

 Nov 26, 2014
 #1
avatar
+10
Best Answer

Saying that y varies directly with x is written mathematically as

 

y = k.x

 

where k is some constant.

 

Using the data values you are given, we can write   14 = k.(-4)

and re-arranging to make k the subject of the formula, we have

determined that k has the value -3.5

 

So the formula in this exercise is now knwn to be y = (-3.5)x

 

So we have now determined that the formula in this exercise is 

Guest Nov 26, 2014
 #2
avatar+109520 
+5

that is a great answer.  thanks anon.

 Nov 26, 2014

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