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3k+b = 185.000 x1 = 3k+b = 185.000
------------------------------- -
5b = 325.000
b = 325.000 : 5
b = 65.000
cari k(kaos) = masukan rumus (3k+b = 185.000)
3k+ 65.000 = 185.000
3k = 185.000-65.000
3k = 120.000
k = 120.000 :3
k = 40.000
tiga baju dan dua kaos berarti rumusnya adalah = 3b+2k
lalu masukin yang sudah diketahui (k dan bnya)
3(65.000)+2(40.000) = 195.000+80.000
hasilnya = 275.000