Do you have an equation for a line? Or do you have a graph of a line?If you have an equation--like y = 3x +6--and if it's in slope-intercept form (y = mx +b) then the slope is m. In the equation y = 3x + 6, the slope is 3.If you have a graph, you can find two points on the graph and compute the slope with the rise over run formula.