Question

10. If x varies directly as 3y, and x = 3 when
y = 4, find x when y = 12.
8.
Hint:
3y 3x4
х
Il
3y = 4x. Put y = 12 and find x​

Answer 1

Answer:

X ∝ 3y

X=k 3y

3=k (3)(4)

3=k 12

3/12=k

1/4=k

0.25=k

X=k 3y

X=0.25(3)(12)

X=9.