Jawapan

  • Pengguna Brainly
2016-03-09T22:25:42+08:00
X - 3y = 4
x = 4 + 3y

2x^2 - 9y^2 = 17
2x^2 - 9y^2 - 17 = 0

2(4+3y)^2 - 9y^2 - 17 = 0
2(4+3y)(4+3y) - 9y^2 - 17 = 0
2(16+12y+12y + 9y^2) - 9y^2 - 17 = 0
32 + 24y + 24y + 18y^2 - 17 = 0
18y^2 + 48y + 15 = 0

y = - 0.3615 , y = - 2.305

x = 4 + 3(-0.3615) , x = 4 + 3(-2.305)
   = 2.916               ,    = - 2.915
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