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Math Help - Parallel/Perpendicular Lines

  1. #1
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    Exclamation Parallel/Perpendicular Lines

    So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.
    Exams tomorrow... please help me!
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  2. #2
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    Quote Originally Posted by kiwifruit View Post
    So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.
    Parallel have the same slope.
    So any line parallel to -2x + y = 4 looks like -2x + y = K.
    Just substitute the values for x & y to find K.
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  3. #3
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by kiwifruit View Post
    So here's the problem: passes through (-2,2), parallel to graph of -2x + y = 4. Then I graph the line that satisfies the condition, but what I really need to know is just how to figure out the slope.
    Exams tomorrow... please help me!
    When lines are parallel, they have the same slope. [i.e. if the slope of one line is m=a then line two has a slope of m_{\parallel}=a

    When lines are perpendicular, its a little different. If line one has a slope of m=a, then line two has a slope of m_{\bot}=-\frac{1}{a}
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