Equations to Represent Relationships Between Two Quantities

Write an equation for this relationship.

• y=5x

• y=1/5x

• y=2x

• y=1/2x

The graph shows the number of points, y, a player earns in a balloon game based on the number of balloons the player pops, x. Which equation best represents the relationship between x and y?

• y = x + 25

• x = 25y

• y = 25x

• x = y + 25

Which equation matches the graph?

• y = 1x

• y = 8x

• y = 3x

• y = 16x

Caylee wants to buy pencils printed with the school mascot. The graph below represents the cost for different numbers of pencils. Which of the following represents the equation for the cost (c) per pencil (p)?

• c = 8.3p

• c = 0.12p

• p = 8.3c

• p = 0.12c

Does this equation represent a proportional relationship?

• Yes

• No

Is this a proportional equation?  Why?

• It is not proportional because it doesn't have a constant.

• It is not proportional because it doesn't have a constant rate of change.

• It is proportional because if x = 0, y = 0.

• It is proportional because it has a y intercept of 22.

Does the equation show a proportional relationship?

• Yes

• No

What is the equation?

• y=4

• y=1.5x

• y=1.05

• y=1.05x

Proportional or Not Proportional?

• Proportional

• Not Proportional

Write the equation for this table.
K=9

• y=9

• y=9x

• y=1/9