If (4, 19) is a solution of the equation $y = a x + 3$ , then a is equal to

3

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4

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5

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6

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Solution

The correct option is C $4$
$∵ y = a x + 3$
$19 = a (4) + 3$
$\Rightarrow 4 a = 16 \Rightarrow a = 4$

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