Graphing Proportional Relationships

Which of the equations below is proportional?

• y = 6x

• y = 3x + 2

• y = 2x + 4

• y = -2x -1

Tags

CCSS.7.RP.A.2D

Will the graph of a proportional relationship go through the origin?

• Always

• Sometimes

• Never

Answer explanation

Proportional graphs ALWAYS pass through or start at the origin.

Tags

CCSS.7.RP.A.2D

Is this graph proportional?

• No, it passes through the origin

• No, it is a single straight line

• Yes, it passes through the origin and is a single straight line

Tags

CCSS.7.RP.A.2D

Which variable is represented by the horizontal axis?

• x

• y

• z

• The origin

Answer explanation

x is the horizontal axis, y is the vertical axis.

Tags

CCSS.8.F.A.1

CCSS.HSF.IF.A.1

What tells us this is not a proportional graph?

• We don't know what number it starts at.

• It does not start at the origin

• But it IS proportional!

Tags

CCSS.7.RP.A.2D

Proportional?

• Yes,

• No, its facing the wrong way

Tags

CCSS.7.RP.A.2D

The constant of proportionality is the same as...

• the origin

• the y-intercept

• the unit rate

Tags

CCSS.7.RP.A.2B

All proportional Relationships... (select all correct answers)

• Go through the origin

• compare an x and a y on a graph

• have a constant slope

Tags

CCSS.7.RP.A.2D

What is the constant of proportionality?

• 3 feet per minute

• 6 feet per minute

• 1 minute per 3 feet

• 1 minute per 6 feet

Tags

CCSS.7.RP.A.2D

The constant of proportionality and the slope are the same thing.

• True

• False

Tags

CCSS.8.EE.B.5