Answer:
4th option
Explanation:
Given that the relationship is proportional then the equation relating them is
y = kx ← k is the constant of proportion
To find k use the condition y = 48 , x = 2.5 , then
48 = 2.5k ( divide both sides by 2.5 )
19.2 = k
y = 19.2x ← equation of proportion