Question 366914
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Hi, 
graph the solution
Solving for y
3x - 7y <= 21
-7y <= -3x + 21
y >= (3/7)x  -3 
Graphing the line y = (3/7)x - 3
The graph of y >= (3/7)x - 3 would be the shaded area above and including the line
{{{graph( 300, 300,-6,6,-6,6,(3/7)x - 3) }}}