The speed of a snowboarder from uphill to downhill can be modeled using the equation y=x^2+1 where x is in minutes. the snowboarder's speed at time 0 is 1 and is 2 at time 1. the snowboarder claims that this proves his speed increases linearly. is he right? a. yes, because two points are needed to define a line b. no, because the equation is not linear c. no, because the two points have positive values only d. no, because it does not cross the x-axis