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jawabannya d
2x-5y=9 ......(persamaan 2) dikali 1
⇒2x-6y=10 ......(1)
2x-5y=9 ...... (2)
eliminasi:
-y=1
y=-1
substitusi dari persamaan 1:
x-3y=5
x-3(-1)=5
x=5-3
x=2
3x+2y= 3(2)+2(-1)= 6-2=4