$x^{2} - y^{2} = 9$ , and $x - y = 1$ . What is the value of $x + y$ ?

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Solution

The correct option is C 9
Given, $(x^{2} - y^{2}) = 9$ and $x - y = 1$
$\Rightarrow (x + y) (x - y) = 9$
$\Rightarrow (x + y) (1) = 9$
$\Rightarrow (x + y) = 9$

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