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hendrisyafa
X+y = 2 misal titik A memotong disb x --> y = 0 x + 0 = 2 x = 2 --> A (2,0) misal titk B memotong di sb y --> x = 0 0+y = 2 y = 2 ---> B (0,2)
transformasi M :
A' =
A' (4,2)
B' =
B' (-2,-2)
pers garis g' : A' (4,2) B'(-2,-2)
m = 2-(-2) / 4-(-2) = 4/6 = 2/3
y - b = m (x-a) y +2 = 2/3 (x+2) 3y+6 = 2x+4 2x-3y = 2 ...pers g'
pers g : x + y = 2 ..x2 --> 2x+2y = 4 pers g' : 2x-3y = 2 2x-3y = 2 ------------------- - 5y = 2 y = 2/5
x+2/5 = 2 5x+2 = 10 5x = 8 x = 8/5
titk P (8/5, 2/5)
Transformasi M
P' =
P' (14/5 , 6/5)
garis l mell P'(14/5, 6/5) dan (4,0)
m = (6/5 -0) / (14/5 - 4) x (5/5) = (6-0) / (14-20) = 6/-6 = -1
y - b = m (x-a) y - 0 = -1 (x-4) y = -x+4 x+y - 4 = 0 ....ini pers garis l
misal titik A memotong disb x --> y = 0
x + 0 = 2
x = 2 --> A (2,0)
misal titk B memotong di sb y --> x = 0
0+y = 2
y = 2 ---> B (0,2)
transformasi M :
A' =
A' (4,2)
B' =
B' (-2,-2)
pers garis g' :
A' (4,2) B'(-2,-2)
m = 2-(-2) / 4-(-2)
= 4/6
= 2/3
y - b = m (x-a)
y +2 = 2/3 (x+2)
3y+6 = 2x+4
2x-3y = 2 ...pers g'
pers g : x + y = 2 ..x2 --> 2x+2y = 4
pers g' : 2x-3y = 2 2x-3y = 2
------------------- -
5y = 2
y = 2/5
x+2/5 = 2
5x+2 = 10
5x = 8
x = 8/5
titk P (8/5, 2/5)
Transformasi M
P' =
P' (14/5 , 6/5)
garis l mell P'(14/5, 6/5) dan (4,0)
m = (6/5 -0) / (14/5 - 4) x (5/5)
= (6-0) / (14-20)
= 6/-6
= -1
y - b = m (x-a)
y - 0 = -1 (x-4)
y = -x+4
x+y - 4 = 0 ....ini pers garis l