हिंदी

Solve for x and y: 4x = 17 - x-y8 2y + x = 2 + 5y+23 - Mathematics

Advertisements
Advertisements

प्रश्न

Solve for x and y:

4x = 17 - `[ x - y ]/8`

2y + x = 2 + `[ 5y + 2 ]/3`

योग
Advertisements

उत्तर

The given pair of linear equations are

4x = 17 - `[ x - y ]/8`

⇒ 33x - y = 136                   ...(1) [On Simplifying]

2y + x = 2 + `[ 5y + 2 ]/3`

⇒ 3x + y = 8                     ...(2) [On Simplifying]

Multiply equation (2) by 11, we get,

33x + 11y = 88                   ...(3)

Subtracting equation (1) from (3)

   33x + 11y = 88
33x - y = 136    
     -    +      -         
12y = - 48

y = -4

Substituting y = -4 in equation (1), we get:

33x - (-4) = 136

⇒ 33x = 132

⇒ x = 4

∴ Solution is x = 4 and y = - 4.

shaalaa.com
Methods of Solving Simultaneous Linear Equations by Elimination Method - Method of Elimination by Equating Coefficients
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Simultaneous (Linear) Equations (Including Problems) - Exercise 6 (B) [पृष्ठ ८१]

APPEARS IN

सेलिना Concise Mathematics [English] Class 9 ICSE
अध्याय 6 Simultaneous (Linear) Equations (Including Problems)
Exercise 6 (B) | Q 13.2 | पृष्ठ ८१

संबंधित प्रश्न

For solving pair of equation, in this exercise use the method of elimination by equating coefficients :
3 - (x - 5) = y + 2
2 (x + y) = 4 - 3y


For solving pair of equation, in this exercise use the method of elimination by equating coefficients :
41x + 53y = 135
53x + 41y = 147


Solve for x and y : 
`[ y + 7 ]/5 = [ 2y - x ]/4 + 3x - 5`

`[ 7 - 5x ]/2 + [ 3 - 4y ]/6 = 5y - 18`


Can the following equations hold simultaneously?
7y - 3x = 7
5y - 11x = 87
5x + 4y = 43
If yes, find the value of x and y.


If the following three equations hold simultaneously for x and y, find the value of 'm'.
2x + 3y + 6 = 0
4x - 3y - 8 = 0
x + my - 1 = 0


The sum of the numerator and denominator of a fraction is 12. If the denominator is increased by 3, the fraction becomes `(1)/(2)`. Find the fraction.


A boat goes 18 km upstream in 3 hours and 24 km downstream in 2 hours. Find the speed of the boat in still water and the speed of the stream.


Salman and Kirti start at the same time from two places 28 km apart. If they walk in the same direction, Salman overtakes Kirti in 28 hours but if they walk in the opposite directions, they meet in 4 hours. Find their speeds (in km/h).


Sunil and Kafeel both have some oranges. If Sunil gives 2 oranges to Kafeel, then Kafeel will have thrice as many as Sunil. And if Kafeel gives 2 oranges to Sunil, then they will have the same numbers of oranges. How many oranges does each have?


Two mobiles S1 and S2 are sold for Rs. 10,490 making 4% profit on S1 and 6% on S2. If the two mobiles are sold for Rs.10,510, a profit of 6% is made on S1 and 4% on S2. Find the cost price of both the mobiles.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×