find the equation of the line

If we have a point (x1,y1) and a slope m,find the equation of a line formula.
 
y - y1 = m (x - x1)
 
Example:

     Let's find the equation of the line that passes through the point (4,-3) with a slope of -2.
     
Solution:

         Point (x1,y1) = (4,-3)
     Slope m = -2
    
Formula:
        
     y - y1 = m (x - x1)
    
     y - (-3) = (-2) (x - 4)
    
     y + 3 = -2x + 8
    
     y = -2x + 5
    
     The equation of a line : y = -2x + 5