i have to determine the slope of y=2x^2 - 4x +2

isn't that a parabola? how can it have a slope or does it have two different ones? but how can a curve have a slope?

there is also another problem similar to this

y=x^2 from (-1,1) to (x,y) and it wants me to determine change in y/change in x in terms of x

Thanks!