Question

$x+y=-9$
$x+2y=-25$
According to the system of equations above, what is the value of $x$?

• A. $7$
• B. $8$
• C. $-8$
• D. $-7$

Answer 1

The correct option is A $7$

$x+y=-9...\left(i\right)$
$x+2y=-25...\left(ii\right)$
On doing $\left(ii\right)-\left(i\right)$, we get
$y=-16$
From $\left(i\right)$, $x=-9-y=-9+16=7$
$\therefore x=7$