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maaf ya kalau salah..
smoga bantu
2x+3y=78.000|×2
15x+6y=288.000-
4x+6y=156.000
11x=132.000
x=132.000÷11
x=12.000
sutitusi x=12.000
5x+2y=96.000
5×(12.000)+2y=96.000
60.000+2y=96.000
2y=96.000-60.000
2y=36.000
y=36.000÷2
y=18.000
x=12.000 y=18.000
4x+7y
4×(12.000)+7×(18.000)
=48.000+126.000
=174.000
harga 4kg pepaya dan 7kg jeruk Rp.174.000