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4x+2y+3z=7 ...(2)
5x+4y+2z=7 ...(3)
eliminasi pers (1) & (3) sehingga:
3x+7y=3 ...(4)
eliminasi pers (1) & (2) sehingga:
2x+13y=2 ...(5)
eliminasi pers (4) & (5), maka:
didapatkan y=0
substitusi nilai y=0 ke pers (5):
2x+13(0)=2
2x+0=2
2x=2
x=1
substitusi nilai x=1 & y=0 ke pers (1), sehingga:
2(1)-3(0)+2z=4
2-0+2z=4
2z=4-2
z=1
jdi nilai x,y,z = (1,0,1) b
30). a
31). b