The solution of the given Inequality is; D: x ≤ 6
<h3>How to find the solution of an Inequality?</h3>
We want to find the solution to the Inequality;
5x - 9 ≤ 21
Using Addition property of equality, add 9 to both sides to get;
5x ≤ 30
Using division property of equality, divide both sides by 5 to get;
x ≤ 6
All real numbers less than or equal to 6
Read more about Inequalities at; brainly.com/question/25275758
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