How do you graph $|7x| \ge 21$ ?

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Answer 1 · 2018-05-31T06:52:14

Please refer to the explanation below.

Firstly, simplify the expression.
So we have,

$|7x|>=21$

$=> |x|>=3$ (Dividing both side by 7)

$=> x>=3 or x<=-3$ (Property of modulus)

Since you are going to plot this on 2-D, mark the critical lines, i.e., $x=3 and x=-3$

Now shade all the region on the Right Hand Side of $x=3$
And, region on the Left Hand Side of $x=-3$

You will get your requird graph.

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How do you graph |7x| \ge 21|7x| \ge 21?