Slope and Direct Variation

Determine whether the rate of change is constant. If it​ is, find the rate of change and explain what it represents.

• The change is not constant.

Tags

CCSS.HSF-LE.A.1B

What is the slope of the​ line?

Tags

CCSS.8.EE.B.5

What is the slope of the​ line?

• 1

• -1

• 0

• undefined

Tags

CCSS.8.EE.B.5

Using the slope​ formula, find the slope of the line through the given points.

(11, 0) and (3, -2)

• 4

• -4

Tags

CCSS.8.EE.B.5

Without​ graphing, tell whether the slope of a line that models the linear relationship is​ positive, negative,​ zero, or undefined.

A student earns a 90 on a test for answering one question incorrectly and earns a 60 for answering 4 questions incorrectly.

The slope is...

• positive

• negative

• zero

• undefined

Tags

CCSS.8.EE.B.5

Without​ graphing, find the slope of a line that models the linear relationship.

A student earns a 90 on a test for answering one question incorrectly and earns a 60 for answering 4 questions incorrectly.

The slope is...

• -10

• 10

Tags

CCSS.8.EE.B.5

• Yes, k=3

• Yes, k = 2

• No! Not direct variation!

Tell whether the two quantities vary directly. Explain your reasoning.

the number of incorrect answers on a test and the score on the test

• Yes​, they vary directly. When one quantity ​increases, the other quantity also increases

• ​Yes, they vary directly. When one quantity ​increases, the other quantity does not increase

• No​, they do not vary directly. When one quantity ​increases, the other quantity also increases

• ​No, they do not vary directly. When one quantity ​increases, the other quantity does not increase

Tags

CCSS.HSF-LE.A.1B

Suppose y varies directly with x. Write a direct variation equation that relates x and y.

y = 8 when x = 3

• y = 9

• y = 8

• y = 64

• y = 3