Question

Qual o valor de y no sistema?

2x-y+z=12
2y-z=-13
x+y+z=0

Answer 1

(I) -2(III) ; 0x

(-1 -2(1))y +(1 -2(1))z = 12 -2(0)

-3y -z = 12

-z = 12 +3y

2y +(12 +3y) = -13

5y = -25

y = -5