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Penyelesaian - Absolute value equations

Exact form: y=60,10027
y=60 , \frac{100}{27}
Mixed number form: y=60,31927
y=60 , 3\frac{19}{27}
Decimal form: y=60,3.704
y=60 , 3.704

Other Ways to Solve

Absolute value equations

Penjelasan langkah demi langkah

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
|35y+2|=|34y-7|
without the absolute value bars:

|x|=|y||35y+2|=|34y-7|
x=+y(35y+2)=(34y-7)
x=-y(35y+2)=-(34y-7)
+x=y(35y+2)=(34y-7)
-x=y-(35y+2)=(34y-7)

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||35y+2|=|34y-7|
x=+y , +x=y(35y+2)=(34y-7)
x=-y , -x=y(35y+2)=-(34y-7)

2. Solve the two equations for y

24 additional steps

(35·y+2)=(34y-7)

Subtract from both sides:

(35y+2)-34·y=(34y-7)-34y

Kumpulkan sebutan sejenis:

(35·y+-34·y)+2=(34·y-7)-34y

Kumpulkan pekali:

(35+-34)y+2=(34·y-7)-34y

Cari penyebut sepunya terkecil:

((3·4)(5·4)+(-3·5)(4·5))y+2=(34·y-7)-34y

Darabkan penyebut:

((3·4)20+(-3·5)20)y+2=(34·y-7)-34y

Darabkan pembilang:

(1220+-1520)y+2=(34·y-7)-34y

Gabungkan pecahan:

(12-15)20·y+2=(34·y-7)-34y

Gabungkan pembilang:

-320·y+2=(34·y-7)-34y

Kumpulkan sebutan sejenis:

-320·y+2=(34·y+-34y)-7

Gabungkan pecahan:

-320·y+2=(3-3)4y-7

Gabungkan pembilang:

-320·y+2=04y-7

Permudahkan pembilang sifar:

-320y+2=0y-7

Permudahkan aritmetik:

-320y+2=-7

Subtract from both sides:

(-320y+2)-2=-7-2

Permudahkan aritmetik:

-320y=-7-2

Permudahkan aritmetik:

-320y=-9

Multiply both sides by inverse fraction :

(-320y)·20-3=-9·20-3

Pindahkan tanda negatif dari penyebut ke pembilang:

-320y·-203=-9·20-3

Kumpulkan sebutan sejenis:

(-320·-203)y=-9·20-3

Darabkan pekali:

(-3·-20)(20·3)y=-9·20-3

Permudahkan aritmetik:

1y=-9·20-3

y=-9·20-3

Pindahkan tanda negatif dari penyebut ke pembilang:

y=-9·-203

Darabkan pecahan:

y=(-9·-20)3

Permudahkan aritmetik:

y=60

22 additional steps

(35y+2)=-(34y-7)

Expand the parentheses:

(35·y+2)=-34y+7

Add to both sides:

(35y+2)+34·y=(-34y+7)+34y

Kumpulkan sebutan sejenis:

(35·y+34·y)+2=(-34·y+7)+34y

Kumpulkan pekali:

(35+34)y+2=(-34·y+7)+34y

Cari penyebut sepunya terkecil:

((3·4)(5·4)+(3·5)(4·5))y+2=(-34·y+7)+34y

Darabkan penyebut:

((3·4)20+(3·5)20)y+2=(-34·y+7)+34y

Darabkan pembilang:

(1220+1520)y+2=(-34·y+7)+34y

Gabungkan pecahan:

(12+15)20·y+2=(-34·y+7)+34y

Gabungkan pembilang:

2720·y+2=(-34·y+7)+34y

Kumpulkan sebutan sejenis:

2720·y+2=(-34·y+34y)+7

Gabungkan pecahan:

2720·y+2=(-3+3)4y+7

Gabungkan pembilang:

2720·y+2=04y+7

Permudahkan pembilang sifar:

2720y+2=0y+7

Permudahkan aritmetik:

2720y+2=7

Subtract from both sides:

(2720y+2)-2=7-2

Permudahkan aritmetik:

2720y=7-2

Permudahkan aritmetik:

2720y=5

Multiply both sides by inverse fraction :

(2720y)·2027=5·2027

Kumpulkan sebutan sejenis:

(2720·2027)y=5·2027

Darabkan pekali:

(27·20)(20·27)y=5·2027

Permudahkan pecahan:

y=5·2027

Darabkan pecahan:

y=(5·20)27

Permudahkan aritmetik:

y=10027

3. List the solutions

y=60,10027
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
y=|35y+2|
y=|34y-7|
The equation is true where the two lines cross.

Mengapa belajar ini

Learn more with Tiger

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.