Question

Let x and y be directly related such that y = 9 when x = 3. Find y when x = 7.

Answer 1

y=21

Explanation:

y= 9 cos x =3 so y=3 when x=1 on the base level so if x=7 would be x=1 on the base level * 7 then y=3 on the base level * 7 would be y = 21