Geometry Unit 8

Question 1

Section 8.2:

What is the slope intercept equation?

Answer 1

y=mx+b

Question 2

Section 8.2:

What is the point slope equation?

Answer 2

y-y₁=m(x-x₁)

aka

(y-y1)/(x-x1)=m

aka “rise over run”

Question 3

Section 8.2:

What equation is this? y-y₁=m(x-x₁)

Answer 3

Point-slope equation

Question 4

Section 8.2:

What equation is this? y=mx+b

Answer 4

slope intercept equation

Question 5

Section 8.2:

What is the slope of a line that is perpendicular to a line with a slope of 1/5?

Answer 5

-5

Flip the fraction and flip the sign

Question 6

Section 8.2:

How do you calculate slope given two points?

Answer 6

rise / run or “change in y” / “change in x”

Question 7

Section 8.2:

What is the slope of a line going from points (x1,y1) and (x2,y2)?

Answer 7

(y2-y1) / (x2-x1)
Rise over run

Question 8

Section 8.2:

Rearrange this into point intercept form: -6x+3y=12

Answer 8

Format is y=mx+b

3y=6x+12
y=2x+4

Question 9

What can we say of the slope of two parallel lines AB and CD?

Answer 9

Parallel lines have the same slope.

Question 10

Describe a line with a slope of 0

Answer 10

Zero slope lines are parallel to the X axis

Question 11

Describe a line with an undefined slope

Answer 11

Lines with an undefined slope are parallel to the Y axis

Question 12

Are all horizontal lines parallel? Explain using their slope

Answer 12

1. All horizontal lines have a slope of zero.
2. All lines with the same slope are parallel