jvoliveiraneonp55fex 24/04/2022 4x+y = 19x-y = -1x = -1+y4(-1+y)+y = 19-4+4y+y = 195y = 23y = 23/5y = 4,6
jvoliveiraneonp55fex
4x+y = 19
x-y = -1
x = -1+y
4(-1+y)+y = 19
-4+4y+y = 19
5y = 23
y = 23/5
y = 4,6