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3x+3y=10.. persamaan 2
eliminasi persmaan 1 dan 2
2x+5y=3 dikali 3 .... 6x+15y=9
3x+3y=10 dikali 2 .... 6x+6y=20 -
9y=-11
y=-1,2
subtitusi persmaan 1 dan 2
2x+5y=3
2x+5(-1,2)=3
2x-6=3
2x=3+6
2x=9
x=4,5
maka nilai 3x+2y
3(-1,2)+2(4,5)
3,6+9=12,6
2.
2x+5y=3 | x 3
3x+3y=10 | x 2
-------------
6x+15y=9 (1)
6x+6y=20 (2)
------------ (-)
9y=-11
y=-11/9
substitusi y=-11/9 ke (1)
6x+15y=9
6x+15(-11/9)=9
6x-(55/3)=9
6x=9+(55/3)
6x=82/3
x=82/18
3x+2y=3(82/18)+2(-11/9)
=(82/6) - (22/9)
=101/9
nomor 2