# How do you find the equation of the tangent and normal line to the curve #y=sqrtx# at x=9?

##### 1 Answer

Jan 6, 2017

eqn. tgt:

eqn. normal

#### Explanation:

To find both the equation of the tangent and normal we will use

where

just considering the

the problem now is to find the gradients

**tangent**

eq tgt

**normal**

the normal is perpendicular to the tangent, by definition. So we can use the fact that the product of the gradients of perpendicular lines is

eqn normal