Graphing a two-step inequality - GMAT Quantitative

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Question

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Which of the following inequalities is graphed above?

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Answer

First, we determine the equation of the boundary line. This line includes points and , so the slope can be calculated as follows:

We can find the slope-intercept form of the line by substituting

in the following equation:

The equation of the boundary line is .

The boundary is excluded, as is indicated by the line being dashed, so the equality symbol is replaced by either or . To find out which one, we can test a point in the solution set - for ease, we will choose :

            

            

            

0 is greater than so the correct symbol is .

The correct choice is .

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