Algebra 1 : Systems of Inequalities

Study concepts, example questions & explanations for Algebra 1

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Example Questions

Example Question #71 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-6>37\)

Possible Answers:

\(\displaystyle x>43\) 

\(\displaystyle x< 31\)

\(\displaystyle x< 43\)

\(\displaystyle x>31\)

\(\displaystyle x< \frac{37}{6}\)

Correct answer:

\(\displaystyle x>43\) 

Explanation:

In order to solve the inequality, we will need to add six on both sides.

\(\displaystyle x-6+6>37+6\)

Simplify both sides of the equation.

The answer is:  \(\displaystyle x>43\)

Example Question #72 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-23>47\)

Possible Answers:

\(\displaystyle x>70\)

\(\displaystyle x< 24\)

\(\displaystyle x>23\)

\(\displaystyle x< 70\)

\(\displaystyle x>24\)

Correct answer:

\(\displaystyle x>70\)

Explanation:

In order to solve for x, add 23 on both sides of the equation.

\(\displaystyle x-23+23>47+23\)

Simplify both sides.

The answer is:  \(\displaystyle x>70\)

Example Question #23 : How To Find The Solution To An Inequality With Addition

Solve the inequality:  \(\displaystyle x-12>9\)

Possible Answers:

\(\displaystyle x< 21\)

\(\displaystyle x>21\)

\(\displaystyle x>3\)

\(\displaystyle x>-3\)

\(\displaystyle x< -21\)

Correct answer:

\(\displaystyle x>21\)

Explanation:

In order to solve this inequality, add 12 on both sides.

\(\displaystyle x-12+12>9+12\)

Simplify both sides of the equation.

\(\displaystyle x>21\)

The answer is:  \(\displaystyle x>21\)

Example Question #73 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-9>36\)

Possible Answers:

\(\displaystyle x>45\)

\(\displaystyle x>27\)

\(\displaystyle x< 45\)

\(\displaystyle x< -45\)

\(\displaystyle x>-45\)

Correct answer:

\(\displaystyle x>45\)

Explanation:

To isolate the x variable, add nine on both sides of the equation.

\(\displaystyle x-9+9>36+9\)

Simplify both sides of the equation.

\(\displaystyle x>45\)

The answer is:  \(\displaystyle x>45\)

Example Question #75 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-9>-44\)

Possible Answers:

\(\displaystyle x>35\)

\(\displaystyle x\leq-35\)

\(\displaystyle x< 35\)

\(\displaystyle x>-35\)

\(\displaystyle x< -35\)

Correct answer:

\(\displaystyle x>-35\)

Explanation:

In order to solve this inequality, add nine on both sides.

\(\displaystyle x-9+9>-44+9\)

Simplify both sides of the inequality.

\(\displaystyle x>-35\)

The answer is:  \(\displaystyle x>-35\)

Example Question #73 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle 2x-3>4\)

Possible Answers:

\(\displaystyle x\geq\frac{1}{2}\)

\(\displaystyle x< \frac{7}{2}\)

\(\displaystyle x\geq\frac{7}{2}\)

\(\displaystyle x>\frac{1}{2}\)

\(\displaystyle x>\frac{7}{2}\)

Correct answer:

\(\displaystyle x>\frac{7}{2}\)

Explanation:

Add three on both sides.

\(\displaystyle 2x-3+3>4+3\)

Simplify both sides.

\(\displaystyle 2x>7\)

Divide by two on both sides.

\(\displaystyle \frac{2x}{2}>\frac{7}{2}\)

Simplify both sides.

The answer is:  \(\displaystyle x>\frac{7}{2}\)

Example Question #74 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-9\leq 8\)

Possible Answers:

\(\displaystyle x\leq -1\)

\(\displaystyle x>17\)

\(\displaystyle x\geq 17\)

\(\displaystyle x< 17\)

\(\displaystyle x\leq 17\)

Correct answer:

\(\displaystyle x\leq 17\)

Explanation:

To solve this inequality, simply add nine on both sides.

\(\displaystyle x-9+9\leq 8+9\)

Simplify both sides of the inequality.

\(\displaystyle x\leq 17\)

The answer is:  \(\displaystyle x\leq 17\)

Example Question #23 : How To Find The Solution To An Inequality With Addition

Solve the inequality:  \(\displaystyle x-18>36\)

Possible Answers:

\(\displaystyle x< 18\)

\(\displaystyle x\leq54\)

\(\displaystyle x>18\)

\(\displaystyle x>54\)

\(\displaystyle x< 54\)

Correct answer:

\(\displaystyle x>54\)

Explanation:

In order to solve this inequality, add 18 on both sides.

\(\displaystyle x-18+18>36+18\)

Simplify both sides.

\(\displaystyle x>54\)

The answer is:  \(\displaystyle x>54\)

Example Question #24 : How To Find The Solution To An Inequality With Addition

Solve the inequality: \(\displaystyle x-13< -14\)

Possible Answers:

\(\displaystyle x< -27\)

\(\displaystyle x\geq-1\)

\(\displaystyle x>27\)

\(\displaystyle x< -1\)

\(\displaystyle x>-1\)

Correct answer:

\(\displaystyle x< -1\)

Explanation:

Add \(\displaystyle 13\) on both sides.

\(\displaystyle x-13+13< -14+13\)

Simplify both sides. The sign does not change.

The answer is: \(\displaystyle x< -1\)

Example Question #75 : Systems Of Inequalities

Solve the inequality:  \(\displaystyle x-9>30\)

Possible Answers:

\(\displaystyle x< 39\)

\(\displaystyle x\geq39\)

\(\displaystyle x\leq-39\)

\(\displaystyle x\leq39\)

\(\displaystyle x>39\)

Correct answer:

\(\displaystyle x>39\)

Explanation:

In order to find the solution to this inequality, add nine on both sides.

\(\displaystyle x-9+9>30+9\)

Simplify both sides.  There is no need to change the direction of the sign.

The answer is:  \(\displaystyle x>39\)

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