The y-intercept tells you in the format of y=mx+b (b=y intercept) the starting point of the graph also known as the constant and is also where the line crosses the y-axis
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A straight line has no vertex.
A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.
It could be but it is difficult to tell without seeing the lines!
You need a diagram to tell. Remember, collinear means in a line. If D,e, and H can all be connected by a straight line, then yes, they are collinear.
If you mean points of (-1, 9) and (5, 21) then the slope of the line works out as 2