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Solution of Linear Equation in 2 Variables

If x = 1, y =...

Question

If x = 1, y = 2 is a solution of the equation 3x + 2y = k, the value of k is ___.

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Solution

Putting x = 1, y = 2 in the given equation,
3 x 1 + 2 x 2 = k
$\Rightarrow$ k = 7

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