There is only one straight line through two given points.
The slope of this one is [ (y2 - y1)/(x2 - x1) ] = (6-0)/(4-0) = (6/4) = 1.5
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If two lines have different slopes, then they intersect at exactly one point. It makes no difference what their y-intercepts are.
Actually it IS. perpendicular lines have opposite reciprocal slopes and parallel lines have the same slope.
Slopes of line perpendicular to the x-axis are undefined.
one
They are the same.