You know your slope by finding two points on a line P1(x, y) and P2(x, y) and use the following equation:
m = (y2 - y1)/(x2 - x1).'m is the slop
or
put the line in the form y = mx + C, where m is the slope and C is the y-intersection length
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a positive slope is up and to the right
i dont know 8x+5y=89
You cannot since the information is not sufficient. Furthermore, a triangle does not normally have a slope.
We know that its slope is negative, but without an equation or some points the line passes through we can't determine the actual value of the slope.
Hydraulic gradient