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Solution - Absolute value equations

Exact form:

x = - \frac{19}{2}, \frac{1}{14}

x=-\frac{19}{2} , \frac{1}{14}

Mixed number form:

x = - 9 \frac{1}{2}, \frac{1}{14}

x=-9\frac{1}{2} , \frac{1}{14}

Decimal form:

x = - 9.5, 0.071

x=-9.5 , 0.071

See steps

Step-by-step explanation

1. Rewrite the equation without absolute value bars

Use the rules:
$| x | = | y |$ → $x = \pm y$ and $| x | = | y |$ → $\pm x = y$
to write all four options of the equation
$| 6 x - 10 | = | 8 x + 9 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 6 x - 10 \| = \| 8 x + 9 \|$
$x = + y$	$(6 x - 10) = (8 x + 9)$
$x = - y$	$(6 x - 10) = - (8 x + 9)$
$+ x = y$	$(6 x - 10) = (8 x + 9)$
$- x = y$	$- (6 x - 10) = (8 x + 9)$

When simplified, equations $x = + y$ and $+ x = y$ are the same and equations $x = - y$ and $- x = y$ are the same, so we end up with only 2 equations:

$\| x \| = \| y \|$	$\| 6 x - 10 \| = \| 8 x + 9 \|$
$x = + y$ , $+ x = y$	$(6 x - 10) = (8 x + 9)$
$x = - y$ , $- x = y$	$(6 x - 10) = - (8 x + 9)$

2. Solve the two equations for x

11 additional steps

$(6 x - 10) = (8 x + 9)$

Subtract from both sides:

$(6 x - 10) - 8 x = (8 x + 9) - 8 x$

Group like terms:

$(6 x - 8 x) - 10 = (8 x + 9) - 8 x$

Simplify the arithmetic:

$- 2 x - 10 = (8 x + 9) - 8 x$

Group like terms:

$- 2 x - 10 = (8 x - 8 x) + 9$

Simplify the arithmetic:

$- 2 x - 10 = 9$

Add to both sides:

$(- 2 x - 10) + 10 = 9 + 10$

Simplify the arithmetic:

$- 2 x = 9 + 10$

Simplify the arithmetic:

$- 2 x = 19$

Divide both sides by :

$\frac{(- 2 x)}{- 2} = \frac{19}{- 2}$

Cancel out the negatives:

$\frac{2 x}{2} = \frac{19}{- 2}$

Simplify the fraction:

$x = \frac{19}{- 2}$

Move the negative sign from the denominator to the numerator:

$x = \frac{- 19}{2}$

10 additional steps

$(6 x - 10) = - (8 x + 9)$

Expand the parentheses:

$(6 x - 10) = - 8 x - 9$

Add to both sides:

$(6 x - 10) + 8 x = (- 8 x - 9) + 8 x$

Group like terms:

$(6 x + 8 x) - 10 = (- 8 x - 9) + 8 x$

Simplify the arithmetic:

$14 x - 10 = (- 8 x - 9) + 8 x$

Group like terms:

$14 x - 10 = (- 8 x + 8 x) - 9$

Simplify the arithmetic:

$14 x - 10 = - 9$

Add to both sides:

$(14 x - 10) + 10 = - 9 + 10$

Simplify the arithmetic:

$14 x = - 9 + 10$

Simplify the arithmetic:

$14 x = 1$

Divide both sides by :

$\frac{(14 x)}{14} = \frac{1}{14}$

Simplify the fraction:

$x = \frac{1}{14}$

3. List the solutions

$x = - \frac{19}{2}, \frac{1}{14}$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | 6 x - 10 |$
$y = | 8 x + 9 |$
The equation is true where the two lines cross.

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Why learn this

We encounter absolute values almost daily. For example: If you walk 3 miles to school, do you also walk minus 3 miles when you go back home? The answer is no because distances use absolute value. The absolute value of the distance between home and school is 3 miles, there or back.
In short, absolute values help us deal with concepts like distance, ranges of possible values, and deviation from a set value.

Solution - Absolute value equations

Step-by-step explanation

1. Rewrite the equation without absolute value bars

2. Solve the two equations for x

3. List the solutions

4. Graph

Why learn this

Terms and topics

Related links

Solution - Absolute value equations

Step-by-step explanation

1. Rewrite the equation without absolute value bars

2. Solve the two equations for x

3. List the solutions

4. Graph

Why learn this

Terms and topics

Related links

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