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Matematika SMP Kelas VIII
³/₄.x + ¹/₆.y = 4 ⇒ dikalikan 12
³/₂.x - ²/₃.y = - 2 ⇒ dikalikan 6
Menjadi
9x + 2y = 48
9x - 4y = - 12
----------------- ( - )
6y = 60
Diperoleh y = 10
Substitusikan y ke salah satu persamaan:
9x + 2(10) = 48
9x = 28
Diperoleh x = ²⁸/₉
Diminta 2x - y
= 2(²⁸/₉) - 10
= ⁵⁶/₉ - ⁹⁰/₉
= - ³⁴/₉