I am really confused! How would you work out the gradient of a grph when

y=x to the power of -1? Does anyone know how to do that?

Also say I have the gradient rules for x squared x cubed and x to the power of 4

x squared rule = 2x

x cubed rule = 3x squared

x to the power of four rule = 4x cubed.

Would you be able to work x to the power of a from that?