Answer:
[tex]y=mx-(1+2m)[/tex]
Step-by-step explanation:
A general equation in the slope-intercept form looks like this:
[tex]y=mx+b[/tex]
Where "m" is the slope and "b" is the y-intercept.
In this exercise, the slope is undefined, so let's call it "m".
Also, to find b, we can substitute the point (2, -1) in the equation:
[tex]\begin{gathered} y=mx+b \\ -1=2m+b \\ -1-2m=b \\ b=-1-2m \\ b=-(1+2m) \end{gathered}[/tex]
Substituting in the equation, we have:
[tex]y=mx-(1+2m)[/tex]
