JEE Maths
JEEMathsDifferential EquationsClass 12

When do I use dy/dt = ky in Differential Equations, and what does it mean?

exponential growth (k>0) or decay (k<0); solution y = y₀e^{kt}.

dy/dt = ky — exponential growth (k>0) or decay (k<0); solution y = y₀e^{kt}. Use it when: rate proportional to the amount present. Always check the condition holds before plugging in numbers.

Key point

dy/dt = ky

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