Question

The value of y varies directly with x2, and y = 64 when x = 4.

What is the value of y when x = 6?

Answer 1

equation for direct variation \[\huge\rm y = kx\]
where k is constant of variation
1st) first replace x and y by their values nd solve for k
2nd) replace x and k by their values, find y

Answer 2

remember in that question y varies directly with x^2 <--