Diketahui SPLDV 5x - 3y = 16 dan 3x - 4y = 14 mempunyai solusi x = a dan y = b maka a . b sama dengan?
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3x - 4y = 14 | x5 |
=> 15x - 9y = 48
=> 15x- 20y = 70 _
11x = -22
x = - 2 = a
5x - 3y = 16
-10 - 3y = 16
-3y = 26
y = - 26/3 = 8 2/3 = b
a x b = -2 x - 26/3 = 52/3 = 17 1/3