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High School Math : Basic Single-Variable Algebra

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Example Questions

Example Question #51 : Basic Single Variable Algebra

Solve the inequality for x:

2x+4>64

Possible Answers:

x>30

x<28

x=30

x<30

x>28

Correct answer:

x>30

Explanation:

2x+4>64

Subtract 4 from both sides:

2x > 60

Divide both sides by 2:

x > 30

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Example Question #51 : Basic Single Variable Algebra

Solve for .

$-7x-4\geq10$

Possible Answers:

$x\leq-2$

$x\geq2$

$x\geq-2$

$x\leq2$

Correct answer:

$x\leq-2$

Explanation:

$-7x-4\geq10$

Add 4 to both sides.

$-7x\geq14$

Divide both sides by –7. When dividing by a negative value, we must also change the direction of the inequality sign.

$x\leq-2$

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Example Question #5 : Solving Inequalities

Solve for :

$9x-27\geq6x$

Possible Answers:

$x\geq9$

$x\leq9$

$x\geq3$

x>9

$x\leq3$

Correct answer:

$x\geq9$

Explanation:

$9x-27\geq6x$

Move like terms to the same sides:

$9x-6x\geq27$

Combine like terms:

$3x\geq27$

Divide both sides by 3:

$x\geq9$

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Example Question #52 : Basic Single Variable Algebra

Solve for :

$5-3x\leq14$

Possible Answers:

$x\geq9$

$x\geq3$

$x\geq0$

$x\geq-3$

$x\leq3$

Correct answer:

$x\geq-3$

Explanation:

Inequalities can be treated like any other equation except when multiplying and dividing by negative numbers. When multiplying or dividing by negative numbers, we just flip the sign of the inequality so that becomes , and vice versa.

$5-3x\leq14$

$-3x\leq9$

$\frac{-3x}{-3}\geq\frac{9}{-3}$

$x\geq-3$

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Example Question #1 : Proportionalities

Sarah notices her map has a scale of $\frac{1}{4}\; in=1\; mile$ . She measures $12.5\; in$ between Beaver Falls and Chipmonk Cove. How far apart are the cities?

Possible Answers:

$50\; miles$

$60\; miles$

$75\; miles$

$90\; miles$

$25\; miles$

Correct answer:

$50\; miles$

Explanation:

$\frac{1}{4}\; in=1\; mile$ is the same as $1\; in = 4\; miles$

So to find out the distance between the cities

$12.5\; in \cdot \frac{4\; miles}{1\;in }=50\; miles$

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Example Question #53 : Basic Single Variable Algebra

Sunshine paint is made by mixing three parts yellow paint and one part red paint. How many gallons of yellow paint should be mixed with two quarts of red paint?

(1 gallon = 4 quarts)

Possible Answers:

$1.00\; gallons$

$0.50\; gallons$

$0.75\; gallons$

$1.50\; gallons$

$1.75\; gallons$

Correct answer:

$1.50\; gallons$

Explanation:

First set up the proportion:

$\frac{3\; parts \; yellow}{1 \; part\; red}=\frac{x \; quarts \; yellow}{2 \; quarts \; red}$

x = $6 \; quarts\;yellow\; paint$

Then convert this to gallons:

$6 \; quarts\; \cdot \frac{1 \; gallon}{4\; quarts}= 1.50\; gallons$

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Example Question #246 : Algebra Ii

If is directly proportional to , and x=2 when y=8 , find a formula for .

Possible Answers:

y=8x

$y=\frac{x}{4}$

y=4x

$\frac{y}{4}=x$

y=2x

Correct answer:

y=4x

Explanation:

8=k*2 since x=2 and y=8

Solving for , you get that k=4

Replacing in the original equation, you get the answer of

y=4x

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Example Question #1 : Understanding Indirect Proportionality

If is inversely proportional to , and if x=2 when y=8 , find a formula for .

Possible Answers:

y=16x

y=4x

$y=\frac{x}{16}$

$\frac{16}{y}=x$

$y=\frac{16}{x}$

Correct answer:

$y=\frac{16}{x}$

Explanation:

Since y is inversely porportional to x, you can use the standard equations of $y=\frac{k}{x}$ where k is a constant. Plugging the given x and y into this equation to solve for k, k=16 . To get the answer, substitute k into the standard equation.

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High School Math : Basic Single-Variable Algebra

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #51 : Basic Single Variable Algebra

Example Question #51 : Basic Single Variable Algebra

Example Question #5 : Solving Inequalities

Example Question #52 : Basic Single Variable Algebra

Example Question #1 : Proportionalities

Example Question #53 : Basic Single Variable Algebra

Example Question #246 : Algebra Ii

Example Question #1 : Understanding Indirect Proportionality

All High School Math Resources

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