# SOLUTION: How do I find the equation of a line parallel/perpendicular without a point that it goes through? example: y=3x+9 (I don't have a point that it goes through) do i just plug i

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 Click here to see ALL problems on Linear-equations Question 135170: How do I find the equation of a line parallel/perpendicular without a point that it goes through? example: y=3x+9 (I don't have a point that it goes through) do i just plug in zero for x and solve, then plug zero for y and solve?Found 2 solutions by stanbon, josmiceli:Answer by stanbon(57290)   (Show Source): You can put this solution on YOUR website!find the equation of a line parallel/perpendicular without a point that it goes through? example: y=3x+9 (I don't have a point that it goes through) --------------------- The given line has a slope of 3 ---------------------- "ANY" line parallel to the given line must have slope = 3. e.g. y = 3x+k where k is any number. ======================= "ANY" line perpendicular to the given line must have slope = -1/3. e.g. y (-1/3)x + k where k is any number ========================= Cheers, Stan H. Answer by josmiceli(9668)   (Show Source): You can put this solution on YOUR website!All you know in this case is the slope of a parallel or perpendicular line. If the equation is , then a parallel line will have slope = . A perpendicular line will have slope = . You can write general equations in which the y-intercept is unknown like this: for a parallel line for a perpendicular line In the parallel case, shouldn't be , since that would make it the same line as the original.