Jawapan

2016-09-06T21:26:29+08:00
2x + 10y = 24
x + 20y = 27

2x + 40y = 54
2x + 10y = 24

30y = 30
y = 30 per 3
y = 10

2x + 10(10) = 24
2x + 100 = 24
2x = 100-24
2x = 76
x = 76 bahagi 2
x = 38