Question

Y varies directly with x2 and y = 48 when x = 2.

Which is the quadratic variation equation for the relationship?
Option A: y = ¼x2

Option B: y = 12x2

Option C: y = 4x

Option D: y = x2 + 25

Answer 1

y = 48 when x = 2
y = a · x²
48 = a · 2²
48 = a · 4
a = 48 : 4
a = 12
Answer: B ) y = 12 x²