bayangan titik a(4,-2) jika didilatasi dengan faktor skala 2 terhadap titil pusat (1-1) adalah

jawab

A(x,y) = (4 ,- 2)
D [ (a,b), k) = D [ (1, -1), 2]

x'  = k (x - a) + a
x' = 2(4-1) + 1
x' = 2(3)+1
x'= 7

y' = k(y-b) + b 
y' = 2(-2 +1)  -1
y' = 2(-1) + 1
y' = - 1

bayangan (x' , y' ) = (7, -1)

(X',y') = 2(4-1,-3+1)+(1,-1)
= 2(3,-2) + (1,-1)
= (6,-4) + (1,-1)
= (7,-5)