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Solution - Absolute value equations

Exact form: y=712
y=\frac{7}{12}
Decimal form: y=0.583
y=0.583

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
|y-43|=|y+16|
without the absolute value bars:

|x|=|y||y-43|=|y+16|
x=+y(y-43)=(y+16)
x=-y(y-43)=-(y+16)
+x=y(y-43)=(y+16)
-x=y-(y-43)=(y+16)

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||y-43|=|y+16|
x=+y , +x=y(y-43)=(y+16)
x=-y , -x=y(y-43)=-(y+16)

2. Solve the two equations for y

5 additional steps

(y+-43)=(y+16)

Subtract from both sides:

(y+-43)-y=(y+16)-y

Group like terms:

(y-y)+-43=(y+16)-y

Simplify the arithmetic:

-43=(y+16)-y

Group like terms:

-43=(y-y)+16

Simplify the arithmetic:

-43=16

The statement is false:

-43=16

The equation is false so it has no solution.

19 additional steps

(y+-43)=-(y+16)

Expand the parentheses:

(y+-43)=-y+-16

Add to both sides:

(y+-43)+y=(-y+-16)+y

Group like terms:

(y+y)+-43=(-y+-16)+y

Simplify the arithmetic:

2y+-43=(-y+-16)+y

Group like terms:

2y+-43=(-y+y)+-16

Simplify the arithmetic:

2y+-43=-16

Add to both sides:

(2y+-43)+43=(-16)+43

Combine the fractions:

2y+(-4+4)3=(-16)+43

Combine the numerators:

2y+03=(-16)+43

Reduce the zero numerator:

2y+0=(-16)+43

Simplify the arithmetic:

2y=(-16)+43

Find the lowest common denominator:

2y=-16+(4·2)(3·2)

Multiply the denominators:

2y=-16+(4·2)6

Multiply the numerators:

2y=-16+86

Combine the fractions:

2y=(-1+8)6

Combine the numerators:

2y=76

Divide both sides by :

(2y)2=(76)2

Simplify the fraction:

y=(76)2

Simplify the arithmetic:

y=7(6·2)

y=712

3. Graph

Each line represents the function of one side of the equation:
y=|y-43|
y=|y+16|
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.