Write an equation for the line perpendicular to the y-axis through the point (−9,5)
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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
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