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
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!
+30 
