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Using the standard slope-intercept form for an equation of a line y = mx + b 
 where m is the slope and b the y-intercept.  
For the line 3x-7y=21 state the x-intercept )when y = 0, x = 7  Pt(7,0)
3x-7y=21  OR y = (3/7)x - 3
For the line 3x-7y=21 state the y-intercept  Pt(0,-3)
For the line 3x-7y=21 state the slope  slope  m =  (3/7)
