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secondary 3 | A Maths
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Hi, I need help with this qn, thank you! pls reply asap
Date Posted: 2 years ago
Views: 365
① → 9x + 12y = 44
⇨ y = (44 - 9x)/12
② → 16x + 12y = 27xy
② - ①
7x = 27xy - 44
27xy - 7x = 44
27x•(44 - 9x) - 12•7x = 12•44
9x•(44 - 9x) - 4•7x = 4•44
81x² - 368x + 176 = 0
x = (368±√368²-4×81×176)/(2×81)
x₁ = 4 y₁ = ⅔
x₂ = 0.5432 y₂ = 3.25927
⇨ y = (44 - 9x)/12
② → 16x + 12y = 27xy
② - ①
7x = 27xy - 44
27xy - 7x = 44
27x•(44 - 9x) - 12•7x = 12•44
9x•(44 - 9x) - 4•7x = 4•44
81x² - 368x + 176 = 0
x = (368±√368²-4×81×176)/(2×81)
x₁ = 4 y₁ = ⅔
x₂ = 0.5432 y₂ = 3.25927
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