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Mathematics

Solution of equations x+852y43=0\dfrac{x + 8}{5} - \dfrac{2y - 4}{3} = 0 and y - x = 3 is :

  1. x = 2, y = 5

  2. x = -2, y = 5

  3. x = 2, y = -5

  4. x = -2, y = -5

Linear Equations

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Answer

Given,

Equations :

x+852y43=0\Rightarrow \dfrac{x + 8}{5} - \dfrac{2y - 4}{3} = 0 ……(1)

⇒ y - x = 3

⇒ y = x + 3 ………(2)

Substituting value of y from equation (2) in (1), we get :

x+852(x+3)43=0x+852x+643=0x+852x+23=03(x+8)5(2x+2)15=03x+2410x10=07x+14=07x=14x=147=2.\Rightarrow \dfrac{x + 8}{5} - \dfrac{2(x + 3) - 4}{3} = 0 \\[1em] \Rightarrow \dfrac{x + 8}{5} - \dfrac{2x + 6 - 4}{3} = 0 \\[1em] \Rightarrow \dfrac{x + 8}{5} - \dfrac{2x + 2}{3} = 0 \\[1em] \Rightarrow \dfrac{3(x + 8) - 5(2x + 2)}{15} = 0 \\[1em] \Rightarrow 3x + 24 - 10x - 10 = 0 \\[1em] \Rightarrow -7x + 14 = 0 \\[1em] \Rightarrow 7x = 14 \\[1em] \Rightarrow x = \dfrac{14}{7} = 2.

Substituting value of x in equation (2), we get :

⇒ y = x + 3 = 2 + 3 = 5.

Hence, Option 1 is the correct option.

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