If x varies inversely with v, and x=35 when v=3, find x when v=21

5

Step-by-step explanation:

From the question, we are informed that "x varies inversely with v". This means that

x = k/v

where,

k is a constant

We have to find k when x=35 when v=3

x = k/v

35 = k/3

k = 35 × 3

k = 105

Therefore when v = 21, x will be:

x = k/v

x = 105/21

x = 5

the first one, all those points on the line just make a strait line.