Question

Calcule os sistemas

Answer 1

Resposta:

1)

x=1+3y

2x+5y=13 ==>2*(1+3y)+5y=13

2+6y+5y=13

11y=11  ==>y=1

x=1+3*1=4

x=1  e y=4

2)

x=15-3y

2x+y=10 ==> 2*(15-3y)+y=10

30-6y+y=10

-5y=-20  ==>y=4

x=15-3*4=3

x=3 e y=4

3)

y=2x-12

3x+y=13 ==> 3x+2x-12=13

5x=25 ==>x=5

y=2*5-12=-2

x=5 e y=-2