Jawab:
DIlatasi { (1,1) , k= 2 ) dilanjutkan dengan R( { O, 90]
Penjelasan dengan langkah-langkah:
DIlatasi [ (1,1), k= 2 }
x' - 1 = 2(x - 1) --> x' = 2x - 1
y' - 1 = 2(y - 1) --> y' = 2y - 1
Rotasi { O, 90]
x" = - y'
y" = x'
*
x" = - y' = - (2y - 1)
x" = 1 - 2y --> 2y = 1 - x"
atau y = - 1/2 x" + 1/2
y" = x' = 2x - 1
2x = y" + 1 --> x = 1/2 y" + 1/2
sub ke garis y = 2x + 1
-1/2 x" + 1/2 = 2 (1/2 y" + 1/2) + 1
-1/2 x" + 1/2 = y" + 1 + 1
-1/2 x" + 1/2 = y" + 2
y" = -1/2 x" + 1/2 - 2
y" = - 1/2 x" - 3/2
y = - 1/2 x - 3/2 .....kalikan 2
2y" = - x" - 3
2y = - x - 3
atau x + 2y + 3= 0
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Jawab:
DIlatasi { (1,1) , k= 2 ) dilanjutkan dengan R( { O, 90]
Penjelasan dengan langkah-langkah:
DIlatasi [ (1,1), k= 2 }
x' - 1 = 2(x - 1) --> x' = 2x - 1
y' - 1 = 2(y - 1) --> y' = 2y - 1
Rotasi { O, 90]
x" = - y'
y" = x'
*
x" = - y' = - (2y - 1)
x" = 1 - 2y --> 2y = 1 - x"
atau y = - 1/2 x" + 1/2
*
y" = x' = 2x - 1
2x = y" + 1 --> x = 1/2 y" + 1/2
*
sub ke garis y = 2x + 1
-1/2 x" + 1/2 = 2 (1/2 y" + 1/2) + 1
-1/2 x" + 1/2 = y" + 1 + 1
-1/2 x" + 1/2 = y" + 2
y" = -1/2 x" + 1/2 - 2
y" = - 1/2 x" - 3/2
y = - 1/2 x - 3/2 .....kalikan 2
2y" = - x" - 3
2y = - x - 3
atau x + 2y + 3= 0