Proportionality

How do you find the constant of proportionality for an equation?

• The number in front of y

• The number in front of x

• The number added to x

• The number subtracted from x

Tags

CCSS.7.RP.A.2C

In what form is the equation of a proportional relationship?

• y = mx + b

• y = kx

Tags

CCSS.7.RP.A.2D

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

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

• Look for the k value in front of the x

• Use the equation k = x/y

• Use the equation k = y/x

• Find the number you multiply x by to get y

Tags

CCSS.7.RP.A.2B

How do you write the equation for a proportional table?

• Find k and plug into y = kx

• Find (x, y ) and plug into the equation y = kx

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

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