Question

resolva o sistema no método da substituição :
8x+5y=11
x+5y=3

Answer 1

8x+5y=11
 x+5y=3 (-1)

8x+5y=11
 -x-5y=-3

7x=8
x=8/7
x=1,14

1,14+5y=3
y=1,86/5
y=0,372

Answer 2

8 x + 5 y = 11
x + 5 y = 3
x = 3 - 5 y

8 x + 5 y = 11
8 (3 - 5 y ) + 5 y = 11
24 - 40 y  + 5 y = 11
- 40 y + 5 y = 11 - 24
- 35 y = -13
y -13/-35
y = 13/35
x = 3 - 5 .13/35
x = 3 - 65/35
x =105 - 65/35
x = 40/35
x = 8/7