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Which of the following inequalities has a solution set represented by the following graph?

Which of the following inequalities has a solution set represented by the following-example-1

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There are two ways you could approach this.

The first is to solve each inequality separately and see which one ends up equal to x ≥ -1.

Another and faster option is to test 0 in each inequality, because 0 is in the solution set and 0 is easy to work with. (You could do this for any value in the solution set.)

A: Is 4(0) + 3 > 7 true? No. 3 > 7 is false. This eliminates A.

B. Is 0/3 - 2 ≥ 2 true? No. -2 ≥ 2 is false. This eliminates B.

C. Is -2(0) - 3 ≤ -1 true? Yes. -3 ≤ -1 is false. We cannot eliminate C.

D. Is 0 + 5 < 4 true? No. 5 < 4 is false. This eliminates D.

So based on using x=0, the only possible solution is C.

You can double check this by solving 2x - 3 ≤ -1 for x:

-2x - 3 ≤ -1

-2x ≤ 2 (by adding 3 to both sides)

Now when you divide by -2 to solve for x, remember to flip the inequality.

-2x ≤ 2

x -1

So this confirms that C is correc.

User Holger Knublauch
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