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  2. Solve the following pair of linear equations by the substitution method. (vi) 3x / 2 - 5y / 2 = - 2 x / 3 = y . 2 = 13 / 6

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NCERT

Solve the following pair of linear equations by the substitution method. (vi) 3x / 2 - 5y / 2 = - 2 x / 3 = y . 2 = 13 / 6

Q1.    Solve the following pair of linear equations by the substitution method.

                (vi)    \\\frac{3x}{2} - \frac{5y}{3}= - 2\\ \frac{x}{3} + \frac{y}{2} = \frac{13}{6}

 

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P Pankaj Sanodiya

Given,

  \\\frac{3x}{2} - \frac{5y}{3}= - 2.........(1)\\ \frac{x}{3} + \frac{y}{2} = \frac{13}{6}.............(2)

From (1) we have,

x=\frac{2}{3}\left ( \frac{5y}{3}-2 \right )........(3)

Putting this in (2) we get,

\frac{1}{3}\times\frac{2}{3}\left ( \frac{5y}{3}-2 \right )+\frac{y}{2}=\frac{13}{6}

\frac{10y}{27}-\frac{4}{9}+\frac{y}{2}=\frac{13}{6}

\frac{20y}{54}-\frac{4}{9}+\frac{27y}{54}=\frac{13}{6}

\frac{47y}{54}=\frac{13}{6}+\frac{4}{9}

\frac{47y}{54}=\frac{117}{54}+\frac{24}{54}

47y=117+24

47y=141

y=\frac{141}{47}

y=3

putting this value in (3) we get,

x=\frac{2}{3}\left ( \frac{5y}{3}-2 \right )

x=\frac{2}{3}\left ( \frac{5\times3}{3}-2 \right )

x=\frac{2}{3}\left (5-2 \right )

x=\frac{2}{3}\times 3

x=2

Hence x=2\:\:and\:\:y=3.

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