Question

1- Resolva os sistemas:
(x + y = 15
A) {x- y=3
B)
(x - y = 3
(x+y=9

Answer 1

Explicação passo-a-passo:

A)

x + y = 15

x - y = 3

2x = 18

x = 18/2

x = 9

9 + y = 15

y = 15 - 9

y = 6

B)

x - y = 3

x + y = 9

2x = 12

x = 12/2

x = 6

6 + y = 9

y = 9 - 6

y = 3