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xy = - 1 -------(1)
3x - 4y = 10
On squaring both sides, we get
(3x - 4y)^2 = (10)^2
=> 9x^2 + 16y^2 - 24xy = 100
=> 9x^2 + 16y^2 - 24(-1) = 100
=> 9x^2 + 16y^2 + 24 = 100
=> 9x^2 + 16y^2 = 100 - 24
=> 9x^2 + 16y^2 = 74
3x - 4y = 10
On squaring both sides, we get
(3x - 4y)^2 = (10)^2
=> 9x^2 + 16y^2 - 24xy = 100
=> 9x^2 + 16y^2 - 24(-1) = 100
=> 9x^2 + 16y^2 + 24 = 100
=> 9x^2 + 16y^2 = 100 - 24
=> 9x^2 + 16y^2 = 74
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