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Solution - Absolute value equations

Exact form:

x = \frac{13}{5}, 1

x=\frac{13}{5} , 1

Mixed number form:

x = 2 \frac{3}{5}, 1

x=2\frac{3}{5} , 1

Decimal form:

x = 2.6, 1

x=2.6 , 1

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
$| 3 x - 7 | = | - 2 x + 6 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 3 x - 7 \| = \| - 2 x + 6 \|$
$x = + y$	$(3 x - 7) = (- 2 x + 6)$
$x = - y$	$(3 x - 7) = - (- 2 x + 6)$
$+ x = y$	$(3 x - 7) = (- 2 x + 6)$
$- x = y$	$- (3 x - 7) = (- 2 x + 6)$

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:

$\| x \| = \| y \|$	$\| 3 x - 7 \| = \| - 2 x + 6 \|$
$x = + y$ , $+ x = y$	$(3 x - 7) = (- 2 x + 6)$
$x = - y$ , $- x = y$	$(3 x - 7) = - (- 2 x + 6)$

2. Solve the two equations for x

9 additional steps

$(3 x - 7) = (- 2 x + 6)$

Add to both sides:

$(3 x - 7) + 2 x = (- 2 x + 6) + 2 x$

Group like terms:

$(3 x + 2 x) - 7 = (- 2 x + 6) + 2 x$

Simplify the arithmetic:

$5 x - 7 = (- 2 x + 6) + 2 x$

Group like terms:

$5 x - 7 = (- 2 x + 2 x) + 6$

Simplify the arithmetic:

$5 x - 7 = 6$

Add to both sides:

$(5 x - 7) + 7 = 6 + 7$

Simplify the arithmetic:

$5 x = 6 + 7$

Simplify the arithmetic:

$5 x = 13$

Divide both sides by :

$\frac{(5 x)}{5} = \frac{13}{5}$

Simplify the fraction:

$x = \frac{13}{5}$

8 additional steps

$(3 x - 7) = - (- 2 x + 6)$

Expand the parentheses:

$(3 x - 7) = 2 x - 6$

Subtract from both sides:

$(3 x - 7) - 2 x = (2 x - 6) - 2 x$

Group like terms:

$(3 x - 2 x) - 7 = (2 x - 6) - 2 x$

Simplify the arithmetic:

$x - 7 = (2 x - 6) - 2 x$

Group like terms:

$x - 7 = (2 x - 2 x) - 6$

Simplify the arithmetic:

$x - 7 = - 6$

Add to both sides:

$(x - 7) + 7 = - 6 + 7$

Simplify the arithmetic:

$x = - 6 + 7$

Simplify the arithmetic:

$x = 1$

3. List the solutions

$x = \frac{13}{5}, 1$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | 3 x - 7 |$
$y = | - 2 x + 6 |$
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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