Question 929606
the standard slope-intercept form for an equation of a line is 
{{{y = highlight_green(m)x + highlight(b)}}}  where m is the slope and b the y-intercept.  
,,,,,
-x + 6y = 21
0r
 y = (1/6)x + 21/6
y = (1/6)x + 7/2
m = (1/6)
y-intercept = 7/2