Math Practice 101
Homework Explained - Math Practice 101

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Grade 8 McGraw Hill Glencoe - Answer Keys


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  Independent Practice  

  • Question 1 (request help)

    Dusty's earnings vary directly with the number of papers he delivers. The relationship is shown in the graph below. Determine the amount that Dusty earns for each paper he delivers.
  • $    
  • Question 2 (request help)

    The Thompson family is buying a car that can travel 70 miles on two gallons of gas. Assume that the distance traveled in miles y varies directly with the amount of gas used x. This can be represented by \(\text{y} = 35\text{x}\). Graph the equation on the coordinate plane. How many miles does the car get get per gallon of gas?
  •     miles per gallon
  • Question 3 (request help)

    Tom was comparing computer repair companies. The cost y for Computer Access for x hours is shown in the graph. The cost for Computers R Us can be represented by the equation \(\text{y} = 23.5\text{x}\). Which company's repair price is lower? Explain.
  •    
  • Question 4 (request help)

    The weight of an object on Mars varies directly with its weight on Earth. An object that weighs 50 pounds on Mars weighs 150 pounds on Earth. If an object weighs 120 pounds on Earth, write and solve a direct variation equation to find how much an object would weigh on Mars.
  •     pounds

Determine whether each linear function is a direct variation. If so, state the constant of variation. If not, explain why not.

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