Proportional Relationship

The table below shows the relationship between the number of miles traveled, x, and the number of gallons of gas used, y. Which of the following equations best represents the relationship?

• 35 = 1x

• y = 35x

• y = 3.5x

Which of the following graphs does not represent a proportional relationship?

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Which of the following situations represents a proportional relationship?

• A pizza is $7.95 plus $1.00 for each topping

• A pool fills at a rate of 90 gallons per hour

• A health club charges a $40 membership fee plus $25 per month

• A bank account begins with $350 and gains $30 per month

Jermaine plots the points (0, 0) and (4, 11) on a graph to represent a proportional relationship. Which of the following equations represents the relationship between the x and y-values?

State whether the graph is proportional or non-proportional.

• Proportional

• Non-proportional

A machine packs boxes at a constant rate of 2/3 a box every 1/2 a minute.  What is the number of boxes it packs per minute?

• 1/3

• 3/4

• 7/6

• 4/3

Why does this graph show a non-proportional relationship?

• Because it is proportional

• It goes through the origin

• It does not go through the origin

• It is a straight line

What is the constant of proportionality for this table?

• 1/9

• 9

• 8

Is this table proportional or non-proportional?

• Yes

• No

Determine the missing value in the table.

• 15

• 3

• 1/3

• 9