Question

Mari membantu
Nilai a b c

Answer 1

Verified answer

X - 3y = - 7
x = 3y - 7

subtitusi ke pers :
3x - z = - 2
3(3y - 7) - z = - 2
9y - 21 - z = - 2
9y - z = - 2 + 21
9y - z = 19

eliminasi
3y + 2z = 8 |×3
9y - z = 19
maka
9y + 6z = 24
9y - z = 19
------------------(-)
5z = 5
z = 1

subtitusi
3y + 2z = 8
3y + 2(1) = 8
3y + 2 = 8
3y = 8 - 2
3y = 6
y = 2

subtitusi
x = 3y - 7
x = 3(2) - 7
x = 6 - 7
x = - 1

jadi
a = x = - 1
b = y = 2
c = z = 1
nilai
a - b - c
= - 1 - 2 - 1
= - 4