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Goes from the origin to the North East (up and to the right).
The slope for a straight line graph is the ratio of the amount by which the graph goes up (the rise) for every unit that it goes to the right (the run). If the graph goes down, the slope is negative. For a curved graph, the gradient at any point is the slope of the tangent to the graph at that point.
Do you mean the axis? The y axis goes up and down while the x axis goes left and right.
Any line that goes straight up and down and doesn't lean either way is a vertical line.
If the line slants up and to the right, it has a positive slope. If it is slanting up and to the left, it has a negative slope.