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Dimisalkan x=pulpen dan y=pensil
8x + 6y = 39.000 /x1/ 8x + 6y = 39.000
7x + 3y = 28.500 /x2/ 14x + 6y = 57.000
dikurangi aja yaa, (ini untuk eliminasi `y`) didapat hasil X = 3000 (harga pulpen), lalu substitusi kepersamaan satu (biar cepet), didapat hasil Y= 2500 (harga pensil). ditanyakan 3x + 4y = 3(3000) + 4(2500) = 9000 + 10000= 19.000
semoga membantu :-D
#tambahan "Mencari nilai y"
substitusi nilai x ke persamaan satu
=> 8x + 6y = 39.000
=> 8(3000) + 6y = 39000
=> 24000 + 6y = 39000
=> 6y = 39.000 - 24.000
=> 6y = 15.000
=> y = 15.000/6
=> y = 2500