Answer:
A positive slope is a slope where the line goes up and right, or down and left.
A negative slope is where the line goes down and right, or up and left.
A proportional slope is a straight line that goes through the very middle of a graph (0,0)
A non proportional slope is not a straight line, or is a straight line but doesn't travel through (0,0)
Y-Interecpt is the point where a line travels through the Y axis
Hope it helps!