Interpret Slope and Y-Intercept

Jimmy needs 16 brushes to clean 10 cars.  He needs 20 brushes to clean 14 cars.  If the equation y= x + 6 can be used to determine the number of brushes needed for x cars, what is the meaning of the slope?

• the number of brushes needed per car
• the number of cars cleaned per brush
• the number of brushes
• the number of brushes needed to get started

Tags

CCSS.HSF.LE.B.5

An employer uses the equation
 y = 9x + 100 to determine how much to pay his employees for the holidays.  In the equation, y is the total money paid and x is the number of hours worked.  What is the meaning of the y-intercept?

• the amount of hours need to earn overtime
• money earned each hour
• a pay bonus for employees
• the pay for a really good work

Tags

CCSS.HSF.LE.B.5

The graph represents the money in a savings account.  What is the meaning of the y-intercept?

• The initial deposit was $30
• $30 is added to the account each week
• It took 30 weeks to same enough money to open an account
• not enough information

Tags

CCSS.HSF.LE.B.5

The graph represents gasoline consumption when driving a certain distance in km.  What is the meaning of the slope?

• The tank started with 50 L of gasoline
• the amount of gasoline consumed per km driven
• the distance it takes to lose a Liter of gas
• the gasoline is leaking because the slope is negative.

Tags

CCSS.7.RP.A.2D

The graph represents the height of a burning candle.  What is the meaning of the y-intercept?

• the time it takes to burn the entire candle
• the rate at which the candle is losing height
• the change in the height of the candle each hour
• the original height of the candle

Tags

CCSS.HSF.LE.B.5