Question

Find a + b , If 3a + 2b = 13 and 4a - 2b = 8.

Answer 1

$3a+2b=13$

$4a-2b=8$

____________

$7a+0=21$

$a=\frac{21}{7}=3$

So $3\left(3\right)+2b=13$

$2b=13-9$

$b=\frac{4}{2}=2$

So, $a+b=3+2=5$.