(1,2) adalah penyelesaian dari ax + by = 8 dan 5x + ay = 9. Nilai ab =

(1, 2) maka x = 1 dan y = 2

ax + by = 8
a(1) + b(2) = 8
a + 2b = 8


5x + ay = 9
5(1) + a(2) = 9
5 + 2a = 9
2a = 9 - 5
2a = 4
a = 4 / 2
a = 2

Substitusikan
a + 2b = 8
2 + 2b = 8
2b = 8 - 2
2b = 6
b = 6 / 2
b = 3

maka
a.b = 2 x 3 = 6

Persamaan Linier Dua Variabel

(1,2) --> penyelesaian
Masukkan ke persamaan
5x + 2y = 9
5.1 + 2a = 9
2a = 9 - 5
a = 2

ax + by = 8
2.1 + 2b = 8
2b = 8 - 2
b = 3

Nilai ab
ab = 2 × 3
ab = 6