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3x+y=7
x-y+z=0
_______ +
4x+z=7....pers.1
Eliminasi (z)
2x+3y-2z=3 (x1)⇒2x+3y-2z=3
4x+z=7 (x2) ⇒8x+2z = 14
____________ +
10x+3y=17...pers.2
eliminasi (y)
3x+y=7 (x3)⇒9x+3y=21
10x+3y=17 (x1)⇒10x+3y=17
_________ -
-x=4
x=-4
Subtitusi ke pers.1
4x+z=7⇒4(-4)+z=7⇒-16+z=7⇒z=7+16⇒z=23
Subtitusi ke pers.
3x+y=7⇒3(-4)+y=7⇒-12+y=7⇒y=7+12⇒y=19
Jadi Hp (x,y,z) adalah (-4,19,23) *a