Find 2 points on the line, (x1,y1 ) (x2, y2)
Slope = (y2 - y1)÷(x2-x1)
In the equation of a line y = ax + b , a is the slope>
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Slope of a straight line is the same at all points on the line, whereas for a curved line it changes.
The gradient of the straight line
gradient
0 degrees.
An undefined slope is just a line straight down. The slope is undefined.