If the point $(3, 4)$ lies on the line $a x + y = 10$ , then find the value of $a$ .

1

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2

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4

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Solution

The correct option is A $2$
Since the point lies on the line, $x = 3, y = 4$ must satisfy the equation
$∴ 3 a + 4 = 10$
$\Rightarrow 3 a = 6$
$\Rightarrow a = 2$

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