y=kx

y=kx.  What does the k represent?

• constant of proportionality
• multiplier
• scale factor
• all of these are correct

The constant of proportionality in the equation y = ½x is _______. 

• x
• y
• 1/2
• 2

What makes a graph proportional?

• Straight line
• The line goes through the origin
• Curvy line
• Straight line and the line goes through the origin

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

Which statement below accurately represents the graph?

• $100 is earned for each hour worked
• $200 earned for every 2 hours worked
  is the unit rate
• $500 is earned for every 8 hours worked
• $300 is earned after working 4 hours

Write an equation for this relationship.

• y=18x
• y=18.50x
• y=22.50x
• y=22x

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

Identify the constant of proportionality.

• k = 5

• k = 1/5

• k = 1

• k = 2.5

• none (not proportional)

Which statement best describes this situation?

• Kevin earns $16.50 per hour.

• Kevin earns $8.00 per hour.

• Kevin earns $8.25 per hour.

• Kevin earns $8.50 per hour.

Which is the better buy? a 12 pack of Coke for $3.50 or a six pack of Coke for $1.80?

• The 12 pack of Coke
• The 6 pack of Coke
• Neither
• They are the same