SLOPE CONCEPT

Two Points Are 
A(x1,y1) and B(x2,y2)
Slope Of AB (M) = y2-y1/x2-x1

Angle Value Θ is Given  
M = tanΘ

The Equation Of The Straight Line is Given  
ax+by+c=0
M = -Coefficient x/Coefficient y

Equation Of The Curve is Given  
y = f(x)
M = dy/dx at (x1,y1)