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Solution - Absolute value equations

Exact form:

x = \frac{3}{2}, \frac{5}{4}

x=\frac{3}{2} , \frac{5}{4}

Mixed number form:

x = 1 \frac{1}{2}, 1 \frac{1}{4}

x=1\frac{1}{2} , 1\frac{1}{4}

Decimal form:

x = 1.5, 1.25

x=1.5 , 1.25

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
$| - x + 1 | = | - 3 x + 4 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| - x + 1 \| = \| - 3 x + 4 \|$
$x = + y$	$(- x + 1) = (- 3 x + 4)$
$x = - y$	$(- x + 1) = - (- 3 x + 4)$
$+ x = y$	$(- x + 1) = (- 3 x + 4)$
$- x = y$	$- (- x + 1) = (- 3 x + 4)$

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:

$\| x \| = \| y \|$	$\| - x + 1 \| = \| - 3 x + 4 \|$
$x = + y$ , $+ x = y$	$(- x + 1) = (- 3 x + 4)$
$x = - y$ , $- x = y$	$(- x + 1) = - (- 3 x + 4)$

2. Solve the two equations for x

9 additional steps

$(- x + 1) = (- 3 x + 4)$

Add to both sides:

$(- x + 1) + 3 x = (- 3 x + 4) + 3 x$

Group like terms:

$(- x + 3 x) + 1 = (- 3 x + 4) + 3 x$

Simplify the arithmetic:

$2 x + 1 = (- 3 x + 4) + 3 x$

Group like terms:

$2 x + 1 = (- 3 x + 3 x) + 4$

Simplify the arithmetic:

$2 x + 1 = 4$

Subtract from both sides:

$(2 x + 1) - 1 = 4 - 1$

Simplify the arithmetic:

$2 x = 4 - 1$

Simplify the arithmetic:

$2 x = 3$

Divide both sides by :

$\frac{(2 x)}{2} = \frac{3}{2}$

Simplify the fraction:

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

12 additional steps

$(- x + 1) = - (- 3 x + 4)$

Expand the parentheses:

$(- x + 1) = 3 x - 4$

Subtract from both sides:

$(- x + 1) - 3 x = (3 x - 4) - 3 x$

Group like terms:

$(- x - 3 x) + 1 = (3 x - 4) - 3 x$

Simplify the arithmetic:

$- 4 x + 1 = (3 x - 4) - 3 x$

Group like terms:

$- 4 x + 1 = (3 x - 3 x) - 4$

Simplify the arithmetic:

$- 4 x + 1 = - 4$

Subtract from both sides:

$(- 4 x + 1) - 1 = - 4 - 1$

Simplify the arithmetic:

$- 4 x = - 4 - 1$

Simplify the arithmetic:

$- 4 x = - 5$

Divide both sides by :

$\frac{(- 4 x)}{- 4} = \frac{- 5}{- 4}$

Cancel out the negatives:

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

Simplify the fraction:

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

Cancel out the negatives:

$x = \frac{5}{4}$

3. List the solutions

$x = \frac{3}{2}, \frac{5}{4}$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | - x + 1 |$
$y = | - 3 x + 4 |$
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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