A: -21

B: 10

C: 18

D: 21

SelenaPubblT Nov 25, 2014

#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

Guest Nov 26, 2014

#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