SOLUTION: could you explane to me why i got this marked wrong and how i can correct it? here's what they asked: "find the equation of a line that passes through the origin and the follow

Algebra ->  Linear-equations -> SOLUTION: could you explane to me why i got this marked wrong and how i can correct it? here's what they asked: "find the equation of a line that passes through the origin and the follow      Log On


   



Question 37187: could you explane to me why i got this marked wrong and how i can correct it?
here's what they asked: "find the equation of a line that passes through the origin and the following points." (2,-2)
my answer: y-(-2)=0(x-2)
:) thanx a bunch!!

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
To use the point-slope form, y - y1 = m(x - x1), you need a point AND the slope. The slope needs to be found in the usual way...m = (y2 - y1)/(x2 - x1) = (-2 - 0)/(2 - 0) = -1. NOW plug into the form above and get y - (-2) = (-1)(x - 2) and finally y = -x.