yes we did that but what we are confused about is if we use x = -1 for both points?
because we will input -1 into the original formula, then the first point will be (-1, y(original))
then we get the derivative of the original equation then input x into that equation which will give us (-1,y(derivative of original)) ??????
but then if we find m, the denominator will be equal to ZERO which will give us an undefined function.