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Verified answer
-4x + y = 7y = 7 + 4y ... (i)
7x + 2y = 31 [subtitusi persamaan i ke persamaan ini]
7x + 2(7 + 4y) = 31
7x + 14 + 8y = 31
15x = 17
x = ¹⁷/₁₅
y = 7 + 4(¹⁷/₁₅)
y = ¹⁰⁵/₁₅ + ⁶⁸/₁₅
y = ¹⁷³/₁₅
HP : { ¹⁷/₁₅ , ¹⁷³/₁₅ }