Find dy/dx and d2y/dx2, and find the slope and concavity (if possible) at the given value of the parameter. (if an answer does not exist, enter dne.) parametric equations point x = t , y = 7t − 2 t = 9

By the chain rule,

Then for all the first derivative has a value of 7.

By the product rule,

but , so we're left with

By the chain rule,

but so the second derivative is 0 for all .

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4

the answer is 40.

proof: