If the point $(5, 3)$ lies on the graph of the equation $3 x + a y = 3$ , then find $a$

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Solution

Equation is $3 x + a y = 3$
Point $(5, 3)$ lies on the graph of the equation.
$∴ 3 (5) + a (3) = 3$
$\Rightarrow 3 a = 3 - 15$
$\Rightarrow a = - 4$

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