Question

Tentukan titik kotor dan buat grafik dari persamaan berikut
4x+5y=20
3x+6y=18

Answer 1

12x + 15y = 60
12x + 24y = 72
_____________ -
9y = 12
y = 4/3
4x + 20/3 = 20
4x = 60/3
x = 15/3
Titiknya: (15/3 , 4/3)

Answer 2

4x+5y = 20    l x3l 12x + 15y = 60
3x + 6y = 18  l x4l 12x + 24y = 72

12x + 24y = 72
12x + 15y = 60 -
9y = 12
y = 12/9 = 4/3

4x + 20/3
= 20
4x = 60/3
x = 15/3

koordinat = x=15/3   y = 4/3