Adv
karansingh
  • 0

. Solve for x and y: 0.4x-1.5y = 6.5, 0.3x-0.2y=0.9.

  • 0

which method should we use to solve this.

its from R.D sharma

Share

1 Answer

  1. Given pair of linear equations is

    0.4x – 1.5y = 6.5 …(i)

    And 0.3x + 0.2y = 0.9 …(ii)

    On multiplying Eq. (i) by 3 and Eq. (ii) by 4 to make the coefficients of x equal,

    we get the equation as

    1.2x – 4.5y = 19.5 …(iii)

    1.2x + 0.8y = 3.6 …(iv)

    On subtracting Eq. (iii) from Eq. (iv), we get

    1.2x + 0.8y – 1.2x + 4.5y = 3.6 – 19.5

    ⇒ 5.3y = – 15.9

    y =-15.9/5.3

    ⇒ y = – 3

    On putting y = – 3 in Eq. (ii), we get

    0.3x + 0.2y = 0.9

    ⇒ 0.3x + 0.2( – 3) = 0.9

    ⇒ 0.3x – 0.6 = 0.9

    ⇒ 0.3x = 1.5

    ⇒ x = 1.5/0.3 ⇒ x = 5

    Hence, x = 5 and y = – 3 ,

    • -1
Leave an answer

Leave an answer

Browse

Choose from here the video type.

Put Video ID here: https://www.youtube.com/watch?v=sdUUx5FdySs Ex: "sdUUx5FdySs".

Captcha Click on image to update the captcha.

Related Questions