Question

URGENTE < <
SISTEMA DE EQUAÇAO !!
x + y = 54,4
x - y = 5,8 !!

Answer 1

x + y = 54,4  -> x=54,4-y
x - y = 5,8 -> 54,4-y-y=5,8 -> -2y=5,8-54,4 -> -2y=-48,6 -> x=48,6/2 -> x=24,3

x=54,4-24,3
x=30,1