Answer:
y = [tex]\frac{1}{4}[/tex] x
Step-by-step explanation:
Given that x and y vary directly then the equation relating them is
y = kx ← k is the constant of variation
To find k use the pair of values x = 12, y = 3
k = [tex]\frac{y}{x}[/tex] = [tex]\frac{3}{12}[/tex] = [tex]\frac{1}{4}[/tex]
y = [tex]\frac{1}{4}[/tex] x ← equation of variation
