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March 25, 2017

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1. Write the equation of a line in slope-intercept form that has a slope of -1/4 and passes through the point (8, -1).Do not use any spaces. Slope should be a reduced improper fraction.
2.Write the equation of a line in slope-intercept form that passes through the points ( -2, 5) and (-2, 11). Do not use any spaces. Slope should be a reduced improper fraction.

  • Math - ,

    1. You know the slope is -1/4, so the equation must be
    y = (-1/4)x + b
    but the point (8,-1) lies on it, so
    -1 = (-1/4)(8) + b
    -1 = -2 + b
    1 = b

    y =(-1/4)x + 1

    2. the slope is (11-5)/(-2+2) = 7/0
    ahhh, the slope is undefined, so it must be a vertical line, and without any more work we can see the equation is
    x = -2

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