Question

1) Resolva os sistemas:

a) x + y = 7
x- y = 3


b) 2x + y =5
2x + 8y = 12


c) 2x - 8y =32
x + 3y =2​

Answer 1

Resposta:

a) 2x= 10. 5+y= 7

x= 10/2. y= 7-5

x= 5. y= 2

b) 2x+y=5 .(-1). 7y= 7

2x+8y=12 y=1

-2x-y= -5. 2x+8.1=12

2x+8y=12 2x= 12-8. x=4/2. x= 2

c) 2x-8y=32. -14y= 28

x+3y= 2 .(-2) y= 28/14. y= 2

2x-8y= 32. 2x-8.2=32

-2x -6y= -4 2x= 32+16. x= 48/2. x= 24