Question

a)
S2x + y = 7
x-y=8
b)
(x-y=5
13. (x + y) = 27
c)
(2x-y=7
(x+6y=-2
d)
(3a=16+6
2(a +1)-3(b + 2) = a​

Answer 1

Resposta:

a) (x , y) = (5 , - 3)

b) x= 2 e y= 7

c) X=6Y

2X-Y=7

2.6Y-Y=7

12Y-Y=7

11Y=7

Y=7/11

X=6.7/11

X=42/11

d) a = 5,5    

b = 0,5

Espero ter ajudado, bons estudos!!!