If Distance is the ordinate(y-axis) and Time is the abscissa(x-axis) then the slope gives the speed.
If Time is the ordinate(y-axis) and Distance is the abscissa(x-axis) then the slope gives the Time taken per unit of Distance
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Take a tangent at the point where you want the slope. Then the slope of the graph at that point is the slope of the tangent, which is found by taking another point on the tangent and then taking the change in y between the two points and divid it by the change in x.
a parabola doesn't have one slope, the slope is constantly changing as you move accross the graph. however, it is possible to find a slope to a line tangent to a point on a parabola. to do this, take the derivative of the equation for the given parabola. then, take the X,Y coordinate and plug in the x value for the point. So, if the graph of of the equation was given by y=x^2, the derivative would be dy/dx=2x. you would then take a point, e.x. (2,4) and plug in the x value, 2, into dy/dx=2x, yielding a slope of 4 for the line tangent to that point.
you get slope when you take 2 points from a graph and divide y2 - y1 by x2 - x1. example: Compute the slope of the line between graph points (13,4) and (6,9). y2 - y1 = 9 - 4 = 5, x2 - x1 = 6 - 13 = -7, so the slope is 5/-7 (five over negative seven)
y intercept is when x is zero then you solve. slope is rise over run or y -y1 divided by x -x1 you graph by puting the y intersept on the y axis then you take the slope and do the rise then the run
Take the largest value in the graph and subtract the smallest value from it.