Question

Berapa kah hasil himpunan penyelesaian dari 18x+12y=42 dgn 1x+2y=5

Answer 1

18x + 12y = 42
sederhanakan (bagi dengan 6)
menjadi
3x + 2y = 7
  x + 2y = 5  -
2x         = 2
x           =2/2 = 1

cari y, subtitusikan x
x+2y = 5
1 + 2y = 5
2y = 5-1
2y = 4
y = 4/2 = 2

HP = {x,y} = {1,2}

Answer 2

1x + 2y = 5
x = 5-2y

18x + 12y = 42
18(5-2y) + 12y = 42
90 - 36y + 12y = 42
-24y = 42-90
-24y = -48
y = 2

x + 2y = 5
x + 4 = 5
x = 1

HP = ( 1,2)