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Solution - Absolute value equations

Exact form: y=0,0
y=0 , 0
See steps

Other Ways to Solve

Absolute value equations

Step-by-step explanation

1. Rewrite the equation without absolute value bars

Use the rules:
|x|=|y| → x=±y and |x|=|y| → ±x=y
to write all four options of the equation
|2y|=|y|
without the absolute value bars:

|x|=|y||2y|=|y|
x=+y(2y)=(y)
x=−y(2y)=−(y)
+x=y(2y)=(y)
−x=y−(2y)=(y)

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||2y|=|y|
x=+y , +x=y(2y)=(y)
x=−y , −x=y(2y)=−(y)

2. Solve the two equations for y

2 additional steps

2y=y

Subtract from both sides:

(2y)-y=y-y

Simplify the arithmetic:

y=y−y

Simplify the arithmetic:

y=0

3 additional steps

2y=−y

Add to both sides:

(2y)+y=-y+y

Simplify the arithmetic:

3y=−y+y

Simplify the arithmetic:

3y=0

Divide both sides by the coefficient:

y=0

3. List the solutions

y=0,0
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
y=|2y|
y=|y|
The equation is true where the two lines cross.

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.

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