Your friend solves the equation $x + 8 = - 10$ . Is your friend correct? Explain your reasoning.

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Solution

Solve the equation
We have,
$\Rightarrow x + 8 = - 10 \Rightarrow x + 8 - 8 = - 10 - 8 [S u b t r a c t 8 f r o m b o t h s i d e s] ∴ x = - 18$
We see that, the value of $x$ obtained is same as the value of $x$ obtained by your friend.
Hence, your friend is correct.

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