the equation of a line in the slope intercept form is given by:
[tex]y=mx+b[/tex]for:
[tex]\begin{gathered} y=-2 \\ m=0 \end{gathered}[/tex]For:
[tex]\begin{gathered} y=9 \\ m=0 \end{gathered}[/tex]Two lines are parallel if :
[tex]\begin{gathered} since\colon \\ 0=0 \\ \\ m1=m2 \end{gathered}[/tex]The lines are parallel
