Question 97671
draw a graph with y=|x+21|, domain as a real numbers. 
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You need to plot some points to obtain the graph.
Let x=-21, then y=|-21+21|=0; this gives you the point (-21,0)
Let x = -22, then y =|-22+21|=1 ; this gives you the point (-22,1)
Let x = -20, then y |-20+21}=1 ; this gives you the point (-20,1)
Keep this up to get as many points as you wnat.

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Plot your points on an xy-coordinate system and 
draw a line thru those points; that is the graph you want.
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{{{graph(400,300,-70,30,-5,50,abs(x+21))}}}
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Cheers,
Stan H.