+0  
 
+1
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avatar+30 


What is the equation of the line, in slope-intercept form, that contains the points (−1, 2) and (2, −1)?

y = −3x + 1 

y = −x + 1 

y = x + 1

y = −x + 3

 Apr 29, 2018
 #1
avatar+3731 
+2

Let's plug the values of x and y, in.

 (a): y=-3x+1, 2=-3(-1)+1=2=3+1, nope

 

(b) y=-x+1, 2=1+1, yes, and y=-x+1, -1=-(2)+1, -1=-2+1, yay! 

 

Thus, (b) is our answer!

 smileysmiley

 Apr 29, 2018

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