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Think About a Plan
Point-Slope Form
Boiling Point The relationship between altitude and the boiling point of water is linear.
When the altitude is 8000 ft, water boils at 197.6°F. When the altitude is 4500 ft, water
boils at 203.9°F. Write an equation giving the boiling point b of water (in degrees
Fahrenheit) in terms of the altitude a (in feet). What is the boiling point of water at 2500
ft?
Understanding the Problem
1. What are you given?
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2. In general, how can this information be used to answer the question?
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Planning the Solution
3. What is the slope formula?
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4. Substitute given values into the slope formula and simplify. Show your work.
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5. Which point can be used to write the point-slope form of the equation?
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6. What strategy can you use to solve this problem?
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7. How can you determine the boiling point of water at 2500 ft?
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Getting an Answer
8. Write an equation giving the boiling point b of water (in degrees Fahrenheit) in
terms of the altitude a.
9. What is the boiling point of water at 2500 ft? Show your work.
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