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Since (0, 0) gives 0 < 9 for x + 3y < 9, the solution region is
Athe side with the origin
Bthe line alone, no region
Cboth sides of the line
Dthe side without the origin
Answer & Solution
Correct answer: A. the side with the origin
The test point (0, 0) satisfies the inequality, so the half-plane containing the origin is shaded.
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