If u varies directly with v and u equals 6 when v equals negative 7 what is u when v equals 4

u = -

Step-by-step explanation:

Given that u varies directly with v then the equation relating them is

u = kv ← k is the constant of variation

To find k use the condition u = 6 when v = - 7, thus

k = = = -

u = - v ← equation of variation

When v = 4, then

u = - × 4 = -

Step-by-step explanation:

putting in upper equation to get value of k

u when v=4