Question: 1.Let v= (v 1 , v 2 ) be a direction vector on a line l . The number = (v 2 /v 1 )

1.Let v= (v1, v2) be a direction vector on a line l. The number = (v2/v1)is defined to be the slope of the linelwith, of course, v10. Verify the following:

1.Is the definition ofwell-defined?

2.Show that the line through the point P= (x1, y1) with a slope has the equation y= y1 - (x1-x)

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