Equation   describes a sloping line. For any  
  equation ax+by+c = 0, slope is  .- X intercept is found by setting y to 0: ax+by=c becomes ax=c. that means that x =  c/a. 6/2 = 3.
 - Y intercept is found by setting x to 0: the equation becomes by=c, and therefore y = c/b. Y intercept is 6/1 = 6.
 - Slope is -2/1 = -2.
 -  Equation in slope-intercept form: y=-2*x+6.
 
  
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