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If a line on a graph is rising as it goes from left to right, it has a positive slope. If it is falling from left to right (or rising from right to left) it has a negative slope. If it is horizontal, it has a slope of zero.
a verticla line
They indicate a rise in whatever it is that the graph is measuring.
positive slope, the line goes up (increases) from left to right negative slope, the line goes down (decreases) from left to right zero slope, the line is horizontal (flat) undefined slope, the line is vertical (straight up)
It looks like a straight line, that crosses the y-axis at y=1, and slopes up from left to right with a slope of 1/2 .