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4. Find the value of k, if $x = 2$ , $y = 1$ is a solution of the equation $2x + 3y = k$ .

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Given : $2x + 3y = k$

Putting (2,1),

we have , $k=2x + 3y = 2(2)+3(1)=4+3=7$

Therefore, k=7 for $2x + 3y = k$ putting x=2 and y=1.

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