0.4 Lines

Question 1

Find slope of a line

Answer 1

Question 2

What is the slope of the line containing the points(3, –2) and (0, 1) ?

Answer 2

-1

Question 3

Point-Slope form of an equation

Answer 3

y − y1 = m(x − x1)

where m is the slope

Question 4

slope-intercept form

Answer 4

y = mx + b.

Question 5

How do you know if lines are parallel?

Answer 5

same slope

Question 6

How do you know if lines are perpendicular?

Answer 6

the slopes are opposite reciprocals

m1 =2 m2= -1/2

Question 7

how do you know if a line is vertical?

Answer 7

x

x= 1
x=2

Question 8

How do you know if a line is horizontal?

Answer 8

y

y= 1
y=6