The line is perpendicular to the y-axis means that it is horizontal or parallel to the x-axis, that means that the slope (m)=0

We hav the point (6,-1) pass through the line:

y-y1= m(x-x1)

y+1=0

y=-1

The line is y=-1

The line is perpendicular to the y-axis means that it is horizontal or parallel to the x-axis, that means that the slope (m)=0

We hav the point (6,-1) pass through the line:

y-y1= m(x-x1)

y+1=0

y=-1

The line is y=-1