Question

me ajudemm por favor!!

Answer 1

Letra A:
$\left \{ {{x+y=8} \atop {x-y=4}} \right. \\\\2x=12\to x= \frac{12}{2}\to x=6\\\\ x+y=8\to 6+y=8\to y=8-6\to y=2$

Letra B:
$\left \{ {{x+y=48} \atop {2x-y=6}} \right. \\\\ 3x=54\to x= \frac{54}{3}\to x=18\\\\x+y=48\to 18+y=48\to y=48-18\to y=30$