the slope is -2x = -2
so now use the point-slope form to choose C or D
What is the equation of the line tangent to the function f(x)=-x^2+5 at the point (1,4)?
A. y=-x+5
B. y=-x+9
C. y=-2x+6
D y=-2x+9
6 answers
@ oobleck so that means that the slope is 1. And if point-slope form is y-y1=m(x-x1), wouldn't that give me y-4=x-1?
Noooo!
oobleck just told you the slope is -2, so ......
use your y-y1=m(x-x1)
simplify it, and change it to the form y = mx + b
oobleck just told you the slope is -2, so ......
use your y-y1=m(x-x1)
simplify it, and change it to the form y = mx + b
From that, I got C.
Rate of change quick check
1. D
2. A
3. C
4. C
1. D
2. A
3. C
4. C
Your answers are correct! Good job!
1 answer