## anonymous 5 years ago write an equation of the line containing the given point and perpendicular to the given line (7,9);2x+y=3

1. anonymous

Do you know how perpendicular lines are related to eachother?

2. anonymous

It has to do with their slopes.

3. anonymous

yes

4. anonymous

How are they related?

5. anonymous

that i don't understand how

6. anonymous

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. anonymous

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