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Home > AC > Chapter 7 > Lesson 7.3.4 > Problem 7-114


Find the equation of each line below.  

  1. The line with slope that goes through the point .

    Using , substitute the values of and and solve for .

    Solve for and rewrite the equation substituting and back into their original positions.

  2. A horizontal line that goes through the point .

    A horizontal line has zero slope. Therefore, simply substitute the values for and into the equation and solve for .
    Then, rewrite the equation with and substituted back into their original equations.

  3. The line perpendicular to the line in part (a) above but going through the origin.

    See parts (a) and (b) to solve. Remember that perpendicular lines have opposite reciprocal slopes.