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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
+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

### 2+0 Answers

#1
+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
+112008
+5

that is a great answer.  thanks anon.

Nov 26, 2014