- #1
Nitrate
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- 0
Homework Statement
If xy^2 = 12 and dy/dt = 6, find dx/dt when y = 2.
Homework Equations
The Attempt at a Solution
My teacher wants us to follow a five step method for solving related rates:
Step 1 [Information]:
Assign variable letters to known and unknown quantities
xy^2 = 12
dy/dt = 6
dx/dt = ?
y = 2
Step 2 [Formula]:
Find or develop a formula that relates the main variables in the problemStep 3 [Variable Check]: Eliminate variables, if possible*:
i) substitute constant values** or
ii) use another relation between the variables
Step 4 [Differentiation]: Differentiate the formula with respect to time, and solve for he unknown rate.
Step 5 (solving): substitute known (instantaneous) values, calculating them from given info, if necessary.
Step 6 (answer): state the answer to the problem
I'm not sure where to go from step 2.