Answer:
(a) y = 1.6x
(b) y = 48
Step-by-step explanation:
(a) Since y varies directly as x,
y ∝ x
y = kx [where k = proportionality constant]
If y = 8 and x = 5
By substituting these values in the equation,
8 = 5k
k = [tex]\frac{8}{5}[/tex]
k = 1.6
Therefore, equation will be,
y = 1.6x
(b) If x = 30, then we have to find the value of y.
By substituting the value of x in the equation,
y = 1.6 × 30
y = 48
