Chapter 7 - Integration Techniques - 7.9 Introduction to Differential Equations - 7.9 Exercises - Page 589: 3

$${\text{Two}}$$

$$\eqalign{ & y''\left( t \right) + 9y\left( y \right) = 10 \cr & {\text{The order of a differential equation is the highest order}} \cr & {\text{appearing on a derivative in the equation}}.{\text{ Therefore,}} \cr & {\text{This differential equation is second order, then appear }}{\bf{two}} \cr & {\text{constants in the general solution}}{\text{.}} \cr} $$