Posted by **Sissy needs help** on Wednesday, February 15, 2012 at 10:25am.

Explain why the point-slope formula cannot be used to find the equation of a line that is parallel to the y-axis.

When graphing the equations y =2x -2,y=2x.and y = 2x + 3, what observation can you make about the graphs. Can you make the same observation before graphing the lines? How?

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