Jawabanmu

2014-05-17T20:04:03+07:00
2x+3y=21
x+4y=23 ----> x = 23 - 4y

2 (23 - 4y) + 3y = 21
46 - 8y + 3y = 21
-5y = -25
y = 5

x = 23 - 4(5)
x = 23 - 20
x = 3

titik persekutuan = {(3,5)}