Question

y varies directly as the square of x. When x = 5, y = 100. Find y when x = 6

Answer 1

y=kx^2

Answer 2

kx^2 = y

k5^2 = 100

k = 4

4(6^2) =y

y =144

Answer 3

k=4, thus y=36*4=144

Answer 4

where does the 4 come from though?

Answer 5

show the work please so I can understand it.

Answer 6

If k.x^2 = y and x = 5, y = 100, then

k.5^2 = 100

i.e., 25k = 100

i.e., k = 4