Linear Equation from Context

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

Write a linear equation in slope-intercept form give the point and slope. (-6, -11); slope = 1/2

Write a linear equation in point-slope form given the point and slope: (5, -9), slope = -2/5

Starting at sunrise, the temperature rose 2.5⁰ every hour. After 8 hours, the temperature was 67⁰. Write an equation in point-slope form to model the temperature, y, after x hours after sunrise. If sunrise was at 6:00 AM, what is the temperature at noon?

•   y+67=2.5(x+8) ; the temperature was 62⁰ at noon

•  y−67=2.5(x−8); the temperature was 62⁰ at noon

•  y−67=2.5(x−8); the temperature was 77⁰ at noon

•  y−8=2.5(x−67); the temperature was 77⁰ at noon

The aquarium is draining a large fish tank. The pump they are using can drain 24 gallons per hour. After 3 hours, there are 78 gallons left in the tank. Write an equation in slope-intercept form to model the water left in the tank, y, after x hours of draining. How many gallons were originally in the tank?

Ben and Julia rented a truck from the same company to move to college. Ben drive 150 miles and paid $64.95 while Julia drove 84 miles and paid $45.15. What is the slope and what does it represent in context to the situation.

• m = 0.30; it represents the cost per mile.

• m = 0.30; it represents the initial fee for the moving truck

• m = 19.95; it represents the initial fee for the moving truck

• m = 3.33; it represents the cost per mile.

Allie orders candles from an online company that offers flat rate shipping. She placed an order for 4 candles for $35. A few months later, she placed an order for 12 candles for $95. Write an equation in point-slope form to model the total cost, y, for ordering x candles. How much is shipping?

Which equation represents the graph of the function with point (-2, 5) and slope of 3?

What is the equation and slope of the line shown on the grid?

• y = 6; slope is -1

• x = 6; slope is zero

• y = 6; slope is 6

• x = 6; slope is undefined

Write an equation in slope-intercept form given the point and slope: (-4, -7); slope = 1