Slope=tan(alpha)
Slope=(y1-y0)/(x1-xo)
In google type:
Linear equation
You can find many sites about that.
The equation of a nonvertical line, explain how to fine the slope without finding two points on the line.
2 answers
If the equation is written in the form y = mx + b
the slope is m
if the equation is written in the form
ax + by = c
the slope = -a/b
the slope is m
if the equation is written in the form
ax + by = c
the slope = -a/b