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U has one axis of symmetry- the vertical axis through its middle.
if u mean math then its the x-axis if u want the vertical then its the y-axis
well, first, u have to read off the axis on the horizontal line,then u read off the vertical axis.
after u draw the chart , u decide to work on the early finish or the late finish , and this called t1 .. and nw u have 2 get the time that the activity end on and that's called t2 , t2= t1 + ( (N-1)/R ) N = number of repetitive units R = Rate = number of crew / duration now draw y-axis and x-axis , then draw a parallel line to x-axis at point N on y-axis ,, where the y-axis represent the number of units start from 1 and the (lower) x axis represent the t1 and the ( upper ) x-axis represent the t2
In case of uniform acceleration,the graph will be a straight line with a +ve slope ,if we are taking velocity along Y-axis and time along X-axis.hence it's slope will give u acceleration.