Question

Diketahui 2a + b = 3 dan a - 2b = 4. Nilai dari a : b adalah...
Rumus dan caranya ya please.

Answer 1

2a + b = 3.... (x1)
a - 2b = 4..... (x2)
2a + b = 3
2a - 4b = 8 -
5b    = -5
b    = -1

substitusi
2a + b = 3
2a + (-1) = 3
2a = 3 - (-1)
2a = 3 + 1
2a = 4
a = 2

= a : b
= 2 : (-1)
= -2

Answer 2

2a + b = 3    X2
  a - 2b = 4   X1

4a + 2b = 6
 a - 2b = 4
__________ +
5a = 10
a = 10/5
a = 2

a-2b = 4
2 - 2b = 4
-2b = 4 - 2
-2b = 2
b = 2/-2
b = - 1

a : b
= 2 : (-1)
= -2

Maaf, kalau salah.