Question

tentukan x + y jika 123x + 321y = 345 dan 321x + 123y = 543
Tolong plis

Answer 1

Penjelasan dengan langkah-langkah:

123x + 321y = 345 (×107)

321x + 123y = 543 (×41)

13.161x + 34.347y = 36.915

13.161x + 5.043y = 22.263 –

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29.304y = 14.652

y = 14.652/29.304

y = ½

123x + 321y = 345

123x + 321·½ = 345

123x + 321/2 = 345

123x = 345 - 321/2

123x = 690/2 - 321/2

123x = 369/2

x = 369/2 ÷ 123

x = 3/2

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= x + y

= 3/2 + 1/2

= 4/2

= 2