Bob B.

asked • 05/18/15

A line passes through point (-3,1) and has a slope of -3.

I don't know how to figure this out and get it into y=mx+b form. Any help is appreciated.
 
 

Lisa G.

what does it mean WHEN ASKED which equation represents the line that passes through (1,-3) (-2, 3)? how do I figure this out? A. y= -2x -1
             B. y= -2x + 5
             C. y= -0.5x - 2.5
             D. y= -0.5x + 2
 I just need help to figure out what its asking me to do. or a web site that I can learn linear equations?
Report

02/19/16

Andrew M.

When given two points and you need to find the equation of the line
the first step is to find the slope m.
 
m = rise/run or  (y2-y1)/(x2-x1) = (3-(-3))/(-2-1) = 6/(-3) = -2
 
You now have the slope and 2 points.  You can use either point
and the slope to plug into the slope intercept form
y-y1 = m(x-x1)
 
Let's use (1,-3) along with our slope of -2
 
y-(-3) = -2(x-1)
y+3 = -2x + 2
y = -2x -1
 
Your answer is A
Report

02/20/16

1 Expert Answer

By:

Andrew M. answered • 05/19/15

Tutor
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Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors

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