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Math Help - Elevation ????

  1. #1
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    Question Elevation ????

    A car is traveling down a long, steep hill. The elevation, E, above sea level (in feet) of the car when it is d miles from the top of the hill is given by E=7500-250d, where d can be any number from 0 to 6. Find the slope and y-intercept of the graph of this function and explain what they mean in the contest of the moving car.
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  2. #2
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    Well the elevation is a function of distance so you can probably recognize this as y=7500-250x. The domain of this function is [0,6]

    So graph the function from zero to six.

    The slope is -250 and y intercept is when x=0 and that is 7500

    I don't know what the other thing means
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  3. #3
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    Talking

    Quote Originally Posted by learnmath View Post
    A car is traveling down a long, steep hill. The elevation, E, above sea level (in feet) of the car when it is d miles from the top of the hill is given by E=7500-250d, where d can be any number from 0 to 6. Find the slope and y-intercept of the graph of this function and explain what they mean in the contest of the moving car.
    To learn about straight-line equations (such as how to find the slope and the y-intercept from the slope-intercept form), try here. To learn how to interpret slope and y-intercept in the context of a word problem, try here.

    Long story short: In "y = mx + b", the slope is "m" and the y-intercept is "b"; the slope is the rate of change, and the y-intercept is the starting value.
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