Question

5x-9y=9 4x+2y=16 como fazer essa conta?​

Answer 1

Resposta:

5x - 9y = 9 (4)

4x + 2y = 16 (-5)

20x - 36y = 36

-20x - 10y = -80

-46y = 44

y = 44/-46

y = - 22/23

5x - 9y = 9

5x - 9(-22/23) = 9

5x + 198/22 = 9

5x + 9 = 9

5x = 9 - 9

5x = 0

x = 0

S = { 0 , -22/23 }

4x + 2y = 16

4x + 2(-22/23) = 16

4x -44/23 = 16

4x = 16 + 44/23

4x = 368/23 + 44/23

4x = 412/23

x = 412/23/4

x = 412/92

x = 103/23

S = { 103/23 , -22/23 }