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Solve the following pair of linear equations by the substitution method. (iv) 0.2 x + 0.3 y = 1.3 0.4x + 0.5 y = 2.3

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

                    (iv)    \\0.2x + 0.3y = 1.3\\ 0.4x + 0.5y = 2.3

Answers (1)
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Given, two equations,

\\0.2x + 0.3y = 1.3\\ 0.4x + 0.5y = 2.3

Now, from (1), we have 

y=\frac{1.3-0.2x}{0.3}........(3)

Substituting this in (2), we get 

0.4x+0.5\left(\frac{1.3-0.2x}{0.3}\right)=2.3

\Rightarrow 0.12x+0.65-0.1x=0.69

\Rightarrow 0.02x=0.69-0.65=0.04

\Rightarrow x=2

Substituting this value of x in (3)

\Rightarrow y=\left ( \frac{1.3-0.2x}{0.3} \right )=\left ( \frac{1.3-0.4}{0.3} \right )=\frac{0.9}{0.3}=3

Hence, Solution of the given equations is,

  x=2\:and\:y=3.

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