Proportionality

How do you know if a table is proportional?

• x-y is the same for each ordered pair

• The cross products are equal

• x + y is the same for each ordered pair

• It has a constant of proportionality

Tags

CCSS.7.RP.A.2A

A graph is proportional if...

• It is straight

• It passes through the origin

• Its straight and it passes through the origin

Tags

CCSS.7.RP.A.2D

How do you find the constant of proportionality for a graph?

• Pick a point on the line and use the formula x/y

• Pick a point on the line and use the formula y/x

Tags

CCSS.7.RP.A.2B

The constant of proportionality can also be called the...

• Equation of a proportional relationship

• Unit Rate

• Origin

• Y-intercept

Tags

CCSS.7.RP.A.2B

Does this graph show a proportional relationship?

• Yes, because it is straight

• Yes, because it goes through the origin

• Yes, because it is straight and goes through the origin

• No, it is not

Tags

CCSS.7.RP.A.2D

Does this graph show a proportional relationship?

• Yes, because it is a straight line

• Yes, because it goes through the origin

• Yes, because it is a straight line and goes through the origin

• No, it is not

Tags

CCSS.7.RP.A.2D

Does this equation represent a proportional relationship?

y = 2 + 7x

• Yes, because it has a constant of proportionality

• Yes, because it will be a straight line

• No, because it will not be a straight line

• No, because it will not go through the origin

Tags

CCSS.7.RP.A.2D

Which of the following represents a proportional relationship?

• 5x = y

• 5x + 1 = y

• 1 - 5x = y

• (x)(x) = y

Tags

CCSS.7.RP.A.2D

What is the constant of proportionality for the following table?

• k = 2/3

• k = 3

• k = 2

• k = 3/2

Tags

CCSS.7.RP.A.2B