SOLUTION: 21. Write the equation of the line passing through (2, –2) and (–4, –2).

Algebra ->  Graphs -> SOLUTION: 21. Write the equation of the line passing through (2, –2) and (–4, –2).      Log On


   

Question 27182: 21. Write the equation of the line passing through (2, –2) and (–4, –2).
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Use the formulas
%28y%5B2%5D+-+y%5B1%5D%29+%2F+%28x%5B2%5D+-+x%5B1%5D%29+=+slope
and
%28y+-+y%5B1%5D%29+%2F+%28x+-+x%5B1%5D%29+=+slope
first
-2 - (-2) / -4 - 2 = 0
then
y - (-2) / x - 2 = 0 (I now know the slope is zero)
y + 2 / x - 2 = 0
y + 2 = 0
y = -2
That makes sense, because y didn't change (2, -2) (-4, -2)
so, (any x, -2) solves the equation.