How do i find out if this is a function when i graph this linear equation? y=2x-1​

Choose the point slope form of the equation below that represents the like that passes through the points (-6,4) and (2, 0)

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Find the equation using the point (4,8)