## 1honey 4 years ago write an equation of the line containing the given point and perpendicular to the given line (7,9);2x+y=3

1. polpak

Do you know how perpendicular lines are related to eachother?

2. polpak

It has to do with their slopes.

3. 1honey

yes

4. polpak

How are they related?

5. 1honey

that i don't understand how

6. polpak

I will tell you. Their slops are negative reciprocals of eachother. So if line 1 has a slope $$\frac{a}{b}$$ then a perpendicular line 2 would have a slope of $$\frac{-b}{a}$$

7. polpak

So what is the slope of the line you've been given?