To solve the inequality \( 9x + 15 \geq 51 \), we can follow these steps:
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Subtract 15 from both sides: \[ 9x + 15 - 15 \geq 51 - 15 \ 9x \geq 36 \]
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Divide both sides by 9: \[ \frac{9x}{9} \geq \frac{36}{9} \ x \geq 4 \]
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Graph the solution: On a number line, plot a closed dot on 4 (to indicate that 4 is included in the solution) and shade to the right to show that all numbers greater than or equal to 4 satisfy the inequality.
In order, the steps are:
- Subtract 15 from both sides.
- Divide both sides by 9.
- Graph the solution.
So, the correct order is: 1, 2, 3.