The equation of a nonvertical line, explain how to fine the slope without finding two points on the line.

2 answers

Slope=tan(alpha)

Slope=(y1-y0)/(x1-xo)

In google type:
Linear equation

You can find many sites about that.
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