penyelesaian dari sistem persamaan 2ax + by = 10 dan 10x - 2ay =-b adalah x = 1 dan y = 2 Nili a dan b adalah

2ax + by = 10
10x - 2ay = -b

x = 1
y = 2

substitusi x dan y ke persamaan
2a(1) + b(2) = 10 → 2a + 2b = 10 → a+ b = 5
10(1) + 2a(2) = -b → 10 + 4a = -b → 4a + b = -10

eliminasi
a + b = 5
4a + b = -10
------------------- -
-3a = 15
a = 15 / (-3)
a = -5

a + b = 5
-5 + b = 5
b = 5 + 5
b = 10

Nilai a = -5
Nilai b = 10