Question

2a+b=3 dan a-2b=4 nilai a:b adalah

Answer 1

A-2b =4
a = 4+2b

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

a = 4+2b =4+2.-1 = 4 -2 =2
a:b = -1;2 atau -1/2

Answer 2

2a +b = 3 ---------> b = 3 -2a
a -2b = 4

a -2b = 4
a -2(3 -2a) = 4
a -6 +4a = 4
a +4a = 4 +6
5a = 10
a = 10/5
a = 2

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

Maka nilai :
a : b
= 2 : -1
= -2

Itu jawabannya.