Mempunyai solusi x = 2 dan y = 1, maka a² + b² = ….
Jawaban:
Sistem Persamaan Linier ax – by = 6
2ax + 3by = 2
Dimana x = 2, y = 1
2a – b = 6 4a – 2b = 12
4a + 3b = 2 4a + 3b = 2 _
-5b = 10 ===> b = -2, a = 2
Jadi, a² + b² = 4 + 4
= 8