Answer:
y = 1
Step-by-step explanation:
y = mx + b [ "m" is a slope and "b" is a y-intercept with coordinates ( 0 , b ) ]
y - [tex]y_{1}[/tex] = m ( x - [tex]x_{1}[/tex] )
( [tex]x_{1}[/tex] , [tex]y_{1}[/tex] )
( [tex]x_{2}[/tex] , [tex]y_{2}[/tex] )
m = [tex]\frac{y_{2} -y_{1} }{x_{2} -x_{1} }[/tex]
~~~~~~~~~~~
( - 1 , 1 )
( 2 , 1 )
m = 0
y = 1
