Question

Each equation is followed by the value of the variable. Decide whether these value are the solutions of that equation.

• A. $x-4=3$
• B. $x=-1,7,-7$
• C. $9m=81$
• D. $m=3,9,-3$

Answer 1

The correct option is A $x-4=3$

$\left(1\right)$ $x-4=3,$ $x=-1,7,-7$

$x-4=3$

$\Rightarrow$ $x=3+4$

$\therefore$ $x=7$

$\therefore$ $x=7$ is the solution of equation.

$\left(2\right)$ $9m=81,$ $m=3,9,-3$

$9m=81$

$\Rightarrow$ $m=\frac{81}{9}$

$\therefore$ $m=9$

$\therefore$ $m=9$ is the solution of equation