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Pre-Algebra : Two-Step Equations

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Example Questions

Example Question #18 : Two Step Equations With Fractions

Solve for :

$\frac{2}{3}x-\frac{4}{3}=\frac{5}{3}$

Possible Answers:

None of the other answers.

$x=\frac{23}{6}$

$x=\frac{9}{2}$

$x=\frac{6}{23}$

$x=\frac{2}{9}$

Correct answer:

$x=\frac{9}{2}$

Explanation:

$\frac{2}{3}x-\frac{4}{3}=\frac{5}{3}$

Start by isolating the fraction attached the x variable:

$\frac{2}{3}x{\color{Red} -\frac{4}{3}+\frac{4}{3}}=\frac{5}{3}+\frac{4}{3}$

The red terms cancel out.

We add the right side as usual.

$\frac{2}{3}x=\frac{9}{3}$

Reduce fractions where able and multiply by the reciprocal to isolate x:

${\color{Red} \frac{3}{2}*\frac{2}{3}}x=\frac{9}{3}*\frac{3}{2}$

The red terms cancel to 1 and the right is multiplied as usual.

$x=\frac{9}{2}$

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Example Question #13 : Two Step Equations With Fractions

Solve: $\frac{2}{3}x + 6=\frac{1}{6}$

Possible Answers:

$-\frac{35}{4}$

$-\frac{23}{36}$

$\frac{23}{36}$

$\frac{35}{4}$

$-\frac{5}{12}$

Correct answer:

$-\frac{35}{4}$

Explanation:

Subtract six from both sides of the equation.

$\frac{2}{3}x + 6-(6)=\frac{1}{6}-(6)$

$\frac{2}{3}x=\frac{1}{6}-\frac{36}{6}$

$\frac{2}{3}x=-\frac{35}{6}$

Multiply by $\frac{3}{2}$ on both sides.

$\frac{2}{3}x\times \frac{3}{2}=-\frac{35}{6}\times \frac{3}{2}$

$x=-\frac{35}{4}$

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Example Question #11 : Two Step Equations With Fractions

Solve: $\frac{1}{2}x-\frac{3}{2} = \frac{5}{2}$

Possible Answers:

$\frac{1}{8}$

$-\frac{1}{8}$

Correct answer:

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

To isolate the unknown variable, first add three halves on both sides of the equation.

$\frac{1}{2}x-\frac{3}{2}+\left(\frac{3}{2}\right) = \frac{5}{2}+\left(\frac{3}{2}\right)$

$\frac{1}{2}x = \frac{8}{2}$

Multiply by two on both sides to eliminate the fraction coefficient in front of the variable.

$\frac{1}{2}x \times2= \frac{8}{2}\times2$

x=8

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Example Question #21 : Two Step Equations With Fractions

Solve: $\frac{2}{9}-x = \frac{7}{9}$

Possible Answers:

$\frac{14}{9}$

$\frac{5}{18}$

$-\frac{5}{18}$

$\frac{5}{9}$

$-\frac{5}{9}$

Correct answer:

$-\frac{5}{9}$

Explanation:

Add on both sides of the equation.

$\frac{2}{9}-x +x= \frac{7}{9}+x$

$\frac{2}{9}= \frac{7}{9}+x$

Subtract $\frac{7}{9}$ from both sides of the equation.

$\frac{2}{9}- \frac{7}{9}=x$

$x=-\frac{5}{9}$

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Example Question #81 : Two Step Equations

Solve: $\frac{4}{x} = 16$

Possible Answers:

$\frac{1}{20}$

$\frac{1}{4}$

$\frac{1}{64}$

Correct answer:

$\frac{1}{4}$

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

To isolate , multiply by by both sides on the equation.

$\frac{4}{x} \times x= 16\times x$

4=16x

Divide by 16 on both sides of the equation.

$\frac{4}{16}=\frac{16x}{16}$

$x=\frac{4}{16}=\frac{1}{4}$

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Example Question #21 : Two Step Equations With Fractions

Solve:

$\frac{3}{4x} +1= 16$

Possible Answers:

$\frac{4}{45}$

$\frac{1}{40}$

$\frac{1}{20}$

$\frac{45}{4}$

Correct answer:

$\frac{1}{20}$

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

The objective is to isolate . Subtract one from both sides of the equation.

$\frac{3}{4x} +1-1= 16-1$

$\frac{3}{4x} = 15$

Multiply by on both sides of the equation.

$\frac{3}{4x} \times 4x= 15\times 4x$

3=60x

Divide by sixty on both sides.

$x= \frac{3}{60} = \frac{1}{20}$

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Example Question #141 : Algebraic Equations

Solve: $\frac{1}{3} -x = \frac{1}{7}$

Possible Answers:

$\frac{4}{21}$

$-\frac{1}{4}$

$-\frac{7}{4}$

$-\frac{4}{21}$

$\frac{1}{4}$

Correct answer:

$\frac{4}{21}$

Explanation:

Add on both sides of the equation.

$\frac{1}{3} -x +x= \frac{1}{7}+x$

$\frac{1}{3}= \frac{1}{7}+x$

Subtract $\frac{1}{7}$ on both sides.

$\frac{1}{3}-\frac{1}{7}= \frac{1}{7}-\frac{1}{7}+x$

$\frac{1}{3}-\frac{1}{7}=x$

$\frac{7}{21}-\frac{3}{21}=x$

$x=\frac{4}{21}$

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Example Question #24 : Two Step Equations With Fractions

Solve: $\frac{3}{x} = \frac{1}{6}$

Possible Answers:

$\frac{1}{18}$

$\frac{1}{2}$

Correct answer:

Explanation:

Multiply by on both sides of the equation.

$\frac{3}{x} \times x = \frac{1}{6} \times x$

$3 = \frac{x}{6}$

Multiply by on both sides.

$3 \times 6 = \frac{x}{6} \times 6$

x=18

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Example Question #25 : Two Step Equations With Fractions

Solve:

$\frac{2}{7}x -3 = \frac{22}{7}$

Possible Answers:

$\frac{43}{2}$

$\frac{21}{2}$

$-\frac{21}{2}$

$\frac{1}{2}$

Correct answer:

$\frac{43}{2}$

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

To solve for the unknown variable, first add three on both sides.

$\frac{2}{7}x -3 +3= \frac{22}{7}+3$

$\frac{2}{7}x= \frac{22}{7}+\frac{21}{7}$

$\frac{2}{7}x= \frac{43}{7}$

Multiply $\frac{7}{2}$ on both sides.

$\frac{2}{7}x \times \frac{7}{2}= \frac{43}{7}\times \frac{7}{2}$

The seven in the numerator and in the denominator cancel out and we are left with the final solution,

$x=\frac{43}{2}$ .

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Example Question #81 : Two Step Equations

Solve: $\frac{7}{12}x +9 = 12$

Possible Answers:

$-\frac{7}{2}$

$\frac{36}{7}$

$-\frac{9}{7}$

$-\frac{8}{7}$

Correct answer:

$\frac{36}{7}$

Explanation:

Subtract nine from both sides of the equation.

$\frac{7}{12}x +9 -9= 12-9$

$\frac{7}{12}x = 12-9$

$\frac{7}{12}x = 3$

Multiply $\frac{12}{7}$ on both sides of the equation to isolate the unknown variable.

$\frac{7}{12}x \times \frac{12}{7} = 3\times \frac{12}{7}$

$x=\frac{36}{7}$

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Pre-Algebra : Two-Step Equations

Study concepts, example questions & explanations for Pre-Algebra

All Pre-Algebra Resources

Example Questions

Example Question #18 : Two Step Equations With Fractions

Example Question #13 : Two Step Equations With Fractions

Example Question #11 : Two Step Equations With Fractions

Example Question #21 : Two Step Equations With Fractions

Example Question #81 : Two Step Equations

Example Question #21 : Two Step Equations With Fractions

Example Question #141 : Algebraic Equations

Example Question #24 : Two Step Equations With Fractions

Example Question #25 : Two Step Equations With Fractions

Example Question #81 : Two Step Equations

All Pre-Algebra Resources

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