Answer:
y = 5x
Step-by-step explanation:
the equation of variation in which y varies directly as x is
y = kx ← k is the constant of variation
to find k use the given y = 21.25 when x = 4.25
21.25 = 4.25k ( divide both sides by 4.25 )
5 = k
y = 5x ← equation of variation
