Jika x=2; y = 3x dan 2x-3y+6z = -2, maka nilai z sama dengan ...

Dik. :
x = 2
y = 3x = 3(2) = 6
2x - 3y + 6z = -2
Dit. :
z = ?
Jwb :
2x - 3y + 6z = -2
<=> 2(2) - 3(6) + 6z = -2
<=> 4 - 18 + 6z = -2
<=> 6z = -2 - 4 + 18
<=> 6z = -6 + 18
<=> 6z = 12
<=> z = 12/6
<=> z = 2

2x - 3y + 6z = -2
<=> 2(2) - 3(6) + 6(2) = -2
<=> 4 - 18 + 12 = -2
<=> -14 + 12 = -2
-2 <=> -2 (Terbukti)


Semoga membantu :)