Question

1)[x+y:16 2)[X+Y:20
[x-y:2. X+Y:8
método de adicao

Answer 1

Ola

x + y = 16
x - y = 2

2x = 18
x = 9

9 + y = 16
y = 7 

2)

x + y = 20
x - y = 8 

2x = 28
x = 14

14 + y = 20
y = 6

.

Answer 2

x+y=16
x-y=2

2x=18
x=18/2
x=9

9+y=16
y=16-9
y=7

x+y=20
x-y=8
2x=28
x=28/2
x=14

14+y=20
y=20-14
y=6