How do you find the gradient from the coordinates (y=2x-3)

Do you know what the general equation for a straight line is?

http://www.mathsisfun.com/equation_of_line.html

Heres a website that will help further

You must always remember that the gradient is simply the number infornt of the x term in any straight line equation. So for this particular equation the gradient is 2. The gradient tells us how steep the line is.