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➡ -Y=18-4x ➡ y=4x-18 ➡ 4(5)-18=2.
.
3x+2y-z=17 (kali 2)
x+y+2z = 11 (kali 1)
➡ 6x+4y-2z=34
➡ x + y + 2z=11
____________+
➡ 7x+5y=45
➡ 7x+5(4x-18)=45
➡ 7x+20x-90=45
➡ 27x=45+90
➡ 27x=135
➡ x=5
x + y + 2z=11 ➡ 7+2z=11 ➡ z=2
.
X=5, y=2, z=2
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