Find the value of $y$ in equation $2 x + y = 7$ , if $x = 2$ .

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Solution

$2 x + y = 7$
Put, $x = 2$
$2 (2) + y = 7$
$4 + y = 7$
$y = - 4 + 7$
$∴ y = 3$ .

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