Posted by Mara on Wednesday, October 19, 2011 at 12:09am.
Please, help me with this problem:
frind the derivative of each function at the given number.
21. f(x)= 4x + 5 at 3
22. f(x)= 4 + 3x at 1
thanks

College math  Reiny, Wednesday, October 19, 2011 at 12:33am
Both of your equations are straight lines.
So they have the same slope no matter where you are on the line
21. y = 4x + 5
compare with y = mx + b, where m is the slope
slope = 4
let me know what you got for 22.