Answer:
y = 60
Explanation:
given y is directly proportional to x then the equation relating them is
y = kx ← k is the constant of proportion
to find k use the condition when y = 30 , x = 6
30 = 6k ( divide both sides by 6 )
5 = k
y = 5x ← equation of proportion
when x = 12 , then
y = 5 × 12 = 60