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baju = y
kaos = x
y=3x
substitusikan ke persamaan
2x+3y = 550.000
2x+3(3x) = 550.000
2x+9x = 550.000
11x =550.000
x= 50000 --> harga satubuah kaos
y= 3x = 3 (50.000)=150.000 --> harga satu buah baju
harga 2y + 3x = 2 (150.000) + 3(50.000) = 300.000+150.000=450.000
semoga membantu