X+y+z=3 3y-z=21 2x+y+3z=-5 dicari z dicari subsititusi

X+y+z=3 3y-z=21 2x+y+3z=-5 dicari z dicari subsititusi

Penjelasan dengan langkah-langkah:

$3y - z = 21 \ z = 3y - 21 \ x + y + z = 3 \ x + y + 3y - 21 = 3 \ x + 4y = 24 \ \ 2x + y + 3z = - 5 \ 2x + y + 3(3y - 21) = - 5 \ 2x + y + 9y - 63 = - 5 \ 2x + 10y = 58$

$z = 3y - 21 \ = 3(5) - 21 = 15 - 21 = - 6$

$2x + 8y = 48 \ 2x + 10y = 58 \ eliminasi \ - 2y = - 10 \ y = 5 \$