Question

Resolva o sistema 3x+2=y+3 ,x+y=4.

Answer 1

3x + 2 = y + 3
x + y = 4

x = 4 - y

3 (4 - y) + 2 = y + 3
12 - 3 y + 2 = y + 3
12 + 2 - 3 = y + 3y
11 = 4y
y = 11/4

x = 4 - 11/4
x = ((4 . 4) - 11)/4
x = (16 - 11)/4
x = 5/4