Constant of Proportionality

What is the unit rate in this proportional relationship?

• 60 miles/1 hour

• 120 miles/ 2 hours

• 1 mile/ 1 hour

• Taylor can write 6 words per minute
• Taylor can write 25 words per minute
• Taylor can write 50 words per minute
• Taylor can write 150 words per minute

Using the equation y=kx, tell what the k is in this graph. (Remember that k is the constant of proportionality or unit rate.)

The table shows the cost of long distance calls based on the number of minutes used. Is there a constant rate of change, and if so what is it?

• Yes, 10 calls per minute
• Yes, $.10 per minute
• Yes, $.40 per minute
• Not a constant rate

• The x-value

• The y-value

• The answer

Answer explanation

The second number is ALWAYS the y-value

Does this table represent a proportional relationship?

• Yes - there is a constant of proportionality

• No - there is not a constant of proportionality

The constant of proportionality is the same as...

• the origin

• the y-intercept

• the unit rate

What is the constant rate of change? (Unit Rate)

• $164 per month

• $80 per month.

• $82 per month.

• $41 per month.

Find the constant rate of change for this graph.

• 2 lb per person

• 1 lb per person

• 3 lb per person

• 4 lb per person

 Is this table proportional or non-proportional?

• Proportional
• Non-Proportional