Question

gente montem as contas completas porfavor


9) {2x-3y=-16
{5x+3y=2


10) {x+y= 11
{x-y=3



11 {x-y=16
{x+y=14
​

Answer 1

Resposta:

9) x=+3y-16/2=12-16/2=2

5(3y-16/2)+3y=2

15y-80/2 +3y=2

15y-80 +6y=4

21y-80=4

-84=-21y   (-1)

84=21y

y=4

10) x=y+3=7

y+3+y=11

2y=8

y=4

11) x=+y+16=15

y+y+16=14

2y=-2

y=-1