Question

x+3y=1 ; 5x+9y=17 método de adição

Answer 1

x+3y=1 (×-3)
5x+9y=17

5x+9y=17
-3x-9y=-3
_______+
2x = 14
x=14/2
x=7

x+3y=1
7+3y=1
3y=1-7
3y=-6
y=-6/3
y=-2