U3 Proportional Relationships

What is the FORMULA to find constant of proportionality

• y=mx+b

• y=kx

• k=y/x

• y=k/x

y=kx.  What does the k represent?

• constant of proportionality

• multiplier

• unit rate

• all of the above

Identify the constant of proportionality.

• k = 6

• k = 12

• k = 1/6

• k = 1/12

• none (not proportional)

Identify the constant of proportionality.

• k = 5

• k = 1/5

• k = 1

• k = 2.5

• none (not proportional)

What makes a graph proportional? Select two answers.

(a)   ​ ​​ (b)  

• straight line through point of origin (0, 0)
• has a constant of proportionality
• a line that connects the dots
• has x-axis and y-axis

What is the constant of proportionality for the following graph?

• 80
• 20
• 40
• 160

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none (not proportional)

Identify the constant of proportionality.

• k = 2

• k = 3

• k = 1.50

• k = 2/3

• none (not proportional)

The point (0, 0) is called the origin.

• True
• False

If Justin ordered 5 ice cream bars for $12.25, how much was each ice cream bar?

• $2.45
• $4.00
• $7.25
• $1.25