Pre-Algebra : One-Step Equations with Integers

Study concepts, example questions & explanations for Pre-Algebra

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Example Questions

Example Question #52 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve:  \(\displaystyle 4x = -44\)

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 40\)

\(\displaystyle -11\)

\(\displaystyle -40\)

\(\displaystyle -48\)

Correct answer:

\(\displaystyle -11\)

Explanation:

To solve this, divide both sides by four.

\(\displaystyle \frac{4x}{4} = \frac{-44}{4}\)

The numerator of the fraction can be split into common factors.

\(\displaystyle \frac{-44}{4} = \frac{-11\times 4} {4}\)

Eliminate the \(\displaystyle 4\) in the numerator and denominator.

The answer is:  \(\displaystyle x=-11\)

Example Question #52 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve:  \(\displaystyle x\div 6 = -30\)

Possible Answers:

\(\displaystyle -\frac{1}{5}\)

\(\displaystyle -\frac{1}{180}\)

\(\displaystyle -5\)

\(\displaystyle -180\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle -180\)

Explanation:

Rewrite the equation.

\(\displaystyle \frac{x}{6}=-30\)

To isolate \(\displaystyle x\), multiply both sides by 6.

\(\displaystyle \frac{x}{6}\times 6=-30\times 6\)

The integer \(\displaystyle 6\) and the denominator are eliminated on the left side of the equation.  Multiply the right side.

The answer is:  \(\displaystyle x=-180\)

Example Question #51 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve the equation:  \(\displaystyle 8x = 888\)

Possible Answers:

\(\displaystyle 880\)

\(\displaystyle 11\)

\(\displaystyle 111\) 

\(\displaystyle 896\)

\(\displaystyle 118\)

Correct answer:

\(\displaystyle 111\) 

Explanation:

In order to solve this equation, we must divide by eight on both sides of the equation.

\(\displaystyle \frac{8x}{8} =\frac{ 888}{8}\)

Divide each digit by eight.

\(\displaystyle x=111\)

Example Question #54 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve:  \(\displaystyle -3x = 69\)

Possible Answers:

\(\displaystyle 23\)

\(\displaystyle -72\)

\(\displaystyle -\frac{1}{23}\)

\(\displaystyle 72\)

\(\displaystyle -23\)

Correct answer:

\(\displaystyle -23\)

Explanation:

In order to solve for \(\displaystyle x\), divide both sides by negative three.

\(\displaystyle \frac{-3x }{-3}= \frac{69}{-3}\)

The negative three will cancel out on the left side.  Divide each digit on the numerator by three.

The answer is:  \(\displaystyle x=-23\)

Example Question #52 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve:  \(\displaystyle 6x= -31\)

Possible Answers:

\(\displaystyle -37\)

\(\displaystyle -\frac{1}{25}\)

\(\displaystyle -25\)

\(\displaystyle -\frac{31}{6}\)

\(\displaystyle -\frac{31}{25}\)

Correct answer:

\(\displaystyle -\frac{31}{6}\)

Explanation:

Solve this equation by dividing six on both sides of the equation.

\(\displaystyle \frac{6x}{6}=\frac{ -31}{6}\)

The sixes will cancel out on the left side.  Leave the right side as an improper fraction.

The answer is:  \(\displaystyle -\frac{31}{6}\)

Example Question #55 : Evaluate Expressions: Ccss.Math.Content.6.Ee.A.2c

Solve:  \(\displaystyle -7+x = 2\)

Possible Answers:

\(\displaystyle -\frac{7}{2}\)

\(\displaystyle 5\)

\(\displaystyle 9\)

\(\displaystyle -9\)

\(\displaystyle -5\)

Correct answer:

\(\displaystyle 9\)

Explanation:

Solve by adding seven on both sides of the equation.  This will isolate \(\displaystyle x\) on both sides of the equation.

\(\displaystyle -7+x +(7) = 2+(7)\)

Add the left side of the equation.

\(\displaystyle x=2+7\)

Add the right side of the equation.

\(\displaystyle x=9\)

The answer is \(\displaystyle 9\).

Example Question #281 : Expressions & Equations

Solve for \(\displaystyle x\):

\(\displaystyle \frac{x}{4}=-9\)

Possible Answers:

\(\displaystyle x=-36\)

\(\displaystyle x=-5\)

\(\displaystyle x=-13\)

\(\displaystyle x=36\)

\(\displaystyle x=0\)

Correct answer:

\(\displaystyle x=-36\)

Explanation:

To solve this equation, we must isolate \(\displaystyle x\) on the left side by multiplying each side by \(\displaystyle 4\), as follows:

\(\displaystyle \frac{x}{4}=-9\)

\(\displaystyle 4(\frac{x}{4})=(-9)(4)\)

\(\displaystyle x=-36\)

Therefore, the correct answer is \(\displaystyle x=-36\).

Example Question #56 : One Step Equations With Integers

Solve for x in the following equation.

\(\displaystyle x - 12 = 9\)

Possible Answers:

\(\displaystyle x = 21\)

\(\displaystyle x = 12\)

\(\displaystyle x = 9\)

\(\displaystyle x = 19\)

\(\displaystyle x = 3\)

Correct answer:

\(\displaystyle x = 21\)

Explanation:

When solving for x, we want x to be alone.  Therefore, in the equation

\(\displaystyle x - 12 = 9\)

we add 12 to both sides. 

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

\(\displaystyle x = 21\)

Example Question #54 : One Step Equations With Integers

Solve:

\(\displaystyle x-241=241\)

Possible Answers:

\(\displaystyle 482\)

\(\displaystyle -482\)

\(\displaystyle 241\)

\(\displaystyle 0\)

\(\displaystyle -241\)

Correct answer:

\(\displaystyle 482\)

Explanation:

To solve for \(\displaystyle x\), we must isolate it to one side of the equation, as follows:

\(\displaystyle x-241=241\)

\(\displaystyle x-241+241=241+241\)

\(\displaystyle x=482\)

Example Question #282 : Expressions & Equations

Find the solution for the variable m.

\(\displaystyle 346 + m = 1111\)

Possible Answers:

\(\displaystyle m = 755\)

\(\displaystyle m = 765.5\)

\(\displaystyle m = 766\)

\(\displaystyle m = 764\)

\(\displaystyle m = 765\)

Correct answer:

\(\displaystyle m = 765\)

Explanation:

In order to find the solution we must isolate the variable m. The first step is to subtract 346 from both sides as follows:

\(\displaystyle 346 - 346 + m = 1111 - 346\)

\(\displaystyle 0 + m = 765\)

\(\displaystyle m = 765\)

We can check the answer by plugging in our solution of 765 into the original equation. 

\(\displaystyle 346 + 765 = 1111\)

\(\displaystyle 1111 = 1111\)

It works.

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