Question

ME AJUDEM PFV:
a) x+2y=10
2x+y=14

b) x+y=6
x+2y=7​

Answer 1

a) x = 6 ; y = 2 .

b) x = 5 ; y = 1 .

CÁLCULO

a) x + 2y = 10

10 2x + y = 14

x + 2y = 10

x = 10 – 2y

2 (10 – 2y) + y = 14

20 – 4y + y = 14

–3y = 14 – 20

y = – 6 ÷ – 3

y = 2

x + 2y = 10

x + 2. 2 = 10

x = 10 – 4

x = 6

b) x + y = 6

x + 2y = 7

x + y = 6

x = 6 – y

(6 – y ) + 2y = 7

6 + y = 7

y = 7 – 6

y = 1

x + y = 6

x + 1 = 6

x = 6 – 1

x = 5