Rate of Change

[Primarygun]

When I let x=A+4/3t, why can't I get the answer?

[Sisyphus]

Because you're looking for change in Y?

 

Since you have a triangle, what you have is

 

a^2 + b^2 = c^2

x^2 + y^2 = 25

y = sqrt(25-x^2)

 

So that's the equation for the height of Y in terms of X. Then take its derivative to get change in Y (in meters) per change in X (in meters). Then, if you know that x is changing at 4/3 m/s at x=3m, multiply by 4/3 to get change in Y at the same moment. Then the change in slope is easy, since it's just change in Y divided by change in X.

[Primarygun]

Yes, this is supposed to be the simpliest, the most common method to solve it.

But, why my method is incorrect?

[BigMoosie]

What are you letting A be?

[Sisyphus]

Your method is incorrect because you're not solving for relevant information.

[Primarygun]

A=x+4/3 t

For the variable in the pyth. theorem.