economics question?

Question

x 0 1 2 3 4 5 6 7 8
y 0 1 4 9 16 25 36 49 64
Calculate the slope of the relationship between x and y when x equals 2 and when x equals 4.

I need help and my professor is unavalable.

thanks steve you rock!

Answer 1

It's not economics. It's a differential.

y = x^2 (this is the curve that your data follows)
y' = 2x (this is the slope of the curve at any point)
slope where x = 2, is 2*2 = 4
slope where x = 4, is 4*2 = 8