Hmwk problem

[Cannon]

the gradient of the tangent to the curve y=ax+b is equal to 30 at the point (3,1). find the values of a and b.

Thanx

[Rtagger]

Well im not sure but if you differentiate to get the gr function youll get:

dy/dx = 2ax = 30

ax = 15 at the point (3,1)

x = 3

3a = 15

a = 5

by substitution:

5*(9) + b = 1

b = -44

Not sure about that mind you.

[Cannon]

Thanx yuv helped me out