SOLUTION: a line with slope -2 passes through the points (-1, 3), what is the equation of the line. a. y=-2x+1 b. y=-3x-1 c. 2y=-x-1 d. 2y=x-1

Algebra ->  Linear-equations -> SOLUTION: a line with slope -2 passes through the points (-1, 3), what is the equation of the line. a. y=-2x+1 b. y=-3x-1 c. 2y=-x-1 d. 2y=x-1      Log On


   

Question 971388: a line with slope -2 passes through the points (-1, 3), what is the equation of the line.
a. y=-2x+1
b. y=-3x-1
c. 2y=-x-1
d. 2y=x-1
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Two ways to handle this:

Just find the equation through point-slope form


OR


Logically eliminate bad choices and accept what will be the correct choice.
-
Reject c and d immediately. Their slopes will be wrong-something you can decide easily in your head.
Reject b, since you know again the slope is wrong.
.
Now, choose "a", equation y=-2x+1.
You can check using the point-slope equation and adjusting the form into slope-intercept.