Jawabanmu

2014-09-11T23:59:40+07:00
Ax + by - 5 = 0
ax + by = 5
(2,1) & (5,5)
(y-y₁)/y₂-y₁ = (x-x₁)/x₂-x₁)
y-1/5-1 = x-2/5-2
y-1/4 = x-2/3
3y - 3 = 4x -8
4x - 3y = 5
Jadi, a= 4 dan b = -3
(4)(-3)² = 36

Semoga membantu.
2014-09-12T00:06:20+07:00
ax + by - 5 = 0
ax + by = 5
(2,1) & (5,5)


(y-y₁)/y₂-y₁ = (x-x₁)/x₂-x₁)
y-1/5-1       =          x-2/5-2
y-1/4          =          x-2/3
3y - 3          =        4x -8
4x - 3y        = 5
Jadi, a= 4 dan b = -3
(4)(-3)² = 16 . 9 = 144