8th Maths 2.3

Chapter 2

Linear Equations in One Variable

NCERT Class 8th solution of Exercise 2.1

NCERT Class 8th solution of Exercise 2.2

NCERT Class 8th solution of Exercise 2.4

NCERT Class 8th solution of Exercise 2.5

NCERT Class 8th solution of Exercise 2.6

Exercise 2.3

`text{Solve the following equations and}` 
`text{check your results.}`
Q1. `text{3x = 2x + 18}`
`text{Solution:}`
`text{3x = 2x + 18}`
`text{3x - 2x = 18}`
`text{x = 18}`
`text{Check the result}`
`3times18 = 2times18 + 18`
`54 = 36 + 18`
`54 = 54`
`text{Answer:}`
`text{x = 18.}`


Q2. `text{5t - 3 = 3t - 5}` 
`text{Solution:}`
`text{5t - 3 = 3t - 5}`
`text{5t - 3t = - 5 + 3}`
`text{2t = - 2}`
`text{t = }- 2/2`
`text{t = - 1}`
`text{Check the result}`
`5times (- 1) - 3 = 3 times (- 1) - 5`
`- 5 - 3 = - 3 - 5`
`-8 = - 8`
`text{Answer:}`
`t = - 1.`
Q3. `text{5x + 9 = 5 + 3x}`
`text{Solution:}`
`text{5x + 9  = 5 + 3x}`
`text{5x - 3x = 5 - 9}`
`text{ 2x = - 4}`
`text{x } = - 4/2`
`text{x} = - 2`
`text{Check the result}`
`5times (- 2) + 9 = 5 + 3 times(- 2)`
`- 10 + 9 = 5 - 6`
`- 1 = - 1`
`text{Answer:}`
`text{x} = - 2.`
Q4. `text{4 z + 3 = 6 + 2z}` 
`text{Solution:}`
`text{4 z + 3 = 6 + 2z}`
`text{4z - 2z = 6 - 3}`
`text{2z = 3}`
`text{z} = 3/2`
`text{Check the result}`
`4 times 3/2 + 3 = 6 + 2 times 3/2`
`6 + 3 = 6 + 3`
`9 = 9` 
`text{Answer:}`
`text{z} = 3/2.`
Q5. `text{2x - 1 = 14 - x}` 
`text{Solution:}`
`text{2x - 1 = 14 - x}`
`text{2x + x = 14 + 1}`
`text{3x = 15}`
`text{x = 5}` 
`text{Check the result}`
`2times 5 - 1 = 14 - 5`
`10 - 1 = 9`
`9 = 9`
`text{Answer:}`
`text{x = 5}`
Q6. `text{8x + 4 = 3(x - 1) + 7}`
`text{Solution:}`
`text{8x + 4 = 3( x - 1) + 7}`
`text{8x + 4 = 3x - 3 + 7}`
`text{8x - 3x = - 3 + 7 - 4}`
`text{5x = - 7 + 7}`
`text{x = 0}`
`text{Check the result}`
`8 times 0 + 4 = 3(0 - 1) + 7`
`0 + 4 = 0 - 3 + 7`
`4 = 4`
`text{Answer:}`
`text{x = 0}`
Q7. `text{x = }4/5 text{(x + 10)}`
`text{Solution:}`
`text{x = } 4/5 text{(x + 10)}`
`text{x = } text{4x}/5 + 8`
`text{x - }text{4x}/5 = 8`
`text{5x - 4x}/5 = 8 `
`text{x}/5 = 8 `
`text{x = 40}`
`text{Check the result}`
`40 = 4/5 (40 + 10)`
`40 = 4/5 (50)`
`40 = 40`
`text{Answer:}`
`text{x = 40}`
Q8. `text{2x}/3 + 1 = text{7x}/15 + 3`
`text{Solution:}`
`text{2x}/3 + 1 = text{7x}/15 + 3`

`text{2x}/3 - text{7x}/15 = 3 - 1`

`text{30x - 21x}/45 = 2`

`text{9x}/45 = 2`

`text{x}/5 = 2`
`text{x = 10}`
`text{Check the result}`
`(2 times 10)/3 + 1 = (7 times 10)/15 + 3`

`20/3 + 1 = 14/3 + 3`

`(20 + 3)/3 = (14 + 9)/3`

`23 = 23`
`text{Answer:}`
`text{x = 10}`.
Q9. `text{2y + }5/3 = 26/3 - text{y}`
`text{Solution:}`
`text{2y + } 5/3 = 26/3 - text{y}`

`text{2y + y} = 26/3 -5/3`

`text{3y} = 21/3`

`text{y} = 7/3`
`text{Check the result}`
`2times 7/3 + 5/3 = 26/3 - 7/3`

`14/3 + 5/3 = 19/3`

`19/3 = 19/3`
`text{Answer:}`
`text{y} = 7/3`.
Q10. `text{3m = 5m} - 8/5`
`text{Solution:}`
`text{3m = 5m} - 8/5`

`text{3m - 5m} = - 8/5`

`-text{2m} = - 8/5`

`text{m} = 4/5`
`text{Check the result}`
`3times4/5 = 5times4/5 - 8/5`

`12/5 = 4 - 8/5`

`12/5 = (20 - 8)/5`

`12/5 = 12/5`
`text{Answer:}`
`text{m} = 4/5`.

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