1
00:00:00,484 --> 00:00:14,914
Sekarang, kita akan kaji kaitan antara 
2 garisan selari.

2
00:00:15,031 --> 00:00:25,911
Ini sangat membantu dlm pengiraan kita nanti.

3
00:00:26,173 --> 00:00:29,763
Terutamanya utk selesaikan 
persamaan garisan lurus.

4
00:00:34,259 --> 00:00:41,819
Cth: y1 iaitu persamaan garis lurus 1.

5
00:00:42,219 --> 00:00:45,019
dan y2.

6
00:00:45,219 --> 00:01:03,549
Perhatikan apa persamaan atau ciri-ciri 
sepunya kedua-dua garisan ini?

7
00:01:03,761 --> 00:01:11,221
Jika garisan selari, 
maka mesti wujud persamaan.

8
00:01:13,250 --> 00:01:18,770
Kedua-dua garisan sama arah,
atau sama condong.


9
00:01:19,035 --> 00:01:25,995
Atau kita sebut sbg sama kecerunan.

10
00:01:37,529 --> 00:01:40,259
Jika garisan 1 selari dgn garisan 2,

11
00:01:40,463 --> 00:01:42,943
( // ialah simbol selari)

12
00:01:43,234 --> 00:01:50,924
maka kecerunan, m1 = m2

13
00:01:51,605 --> 00:02:06,535
Jika m1 = 4, 
maka m2 = 4 juga.

14
00:02:07,518 --> 00:02:14,758
Jika m1 = -5,
maka m2 = -5

15
00:02:20,779 --> 00:02:37,509
Ada 1 lagi jenis garisan iaitu
garisan serenjang.

16
00:02:37,741 --> 00:02:40,541
Maksudnya ia membentuk sudut 90°.

17
00:02:40,747 --> 00:02:44,537
Ini λ1 dan λ2.

18
00:02:44,756 --> 00:02:47,306
Apakah hubungan kedua-dua λ?

19
00:02:47,471 --> 00:02:53,951
Apabila λ1 serenjang (⊥) dgn λ2,

20
00:03:13,489 --> 00:03:17,009
wujud 1 kaitan antara mereka.

21
00:03:17,216 --> 00:03:20,746
Boleh anda teka?

22
00:03:21,228 --> 00:03:24,518
Jika garisan adalah serenjang (⊥),

23
00:03:24,729 --> 00:03:39,029
maka kecerunan, 
m1 x m2 = -1

24
00:03:39,489 --> 00:03:41,629
Jadi, formula kecerunan, m utk 
garis serenjang:

25
00:03:41,753 --> 00:03:45,753
m1m2= -1

26
00:03:47,503 --> 00:03:50,283
Tapi ada jalan kira yg lebih ringkas

27
00:03:50,396 --> 00:03:52,496
utk cari kecerunan garis serenjang.

28
00:03:52,628 --> 00:03:54,758
Anda nak tahu?

29
00:03:59,756 --> 00:04:07,076
Utk garis serenjang,
jika m1 = 3/4,

30
00:04:08,222 --> 00:04:14,782
m2 ialah songsangan bg m1.

31
00:04:16,464 --> 00:04:24,104
Anda songsangkan nilai m1,

32
00:04:24,630 --> 00:04:28,766
maka m2 = 4/3

33
00:04:31,376 --> 00:04:33,272
Tukar tanda nilai.

34
00:04:33,652 --> 00:04:37,940
Jika m1 = +ve,
maka m2 = -ve

35
00:04:44,640 --> 00:04:48,780
Cth lagi:
jika m1 = -2/5

36
00:04:50,514 --> 00:04:53,764
maka songsangan nya:

37
00:04:53,991 --> 00:04:57,991
m2= 5/2

38
00:05:00,406 --> 00:05:05,686
Jika m1=7,

39
00:05:08,212 --> 00:05:10,532
nilai sebenar ialah 7/1,

40
00:05:10,733 --> 00:05:12,883
maka m2=1/7

41
00:05:13,087 --> 00:05:16,807
tukar +ve ke -ve.

42
00:05:18,473 --> 00:05:22,253
Kesimpulannya, inilah hubung kait antara

43
00:05:22,467 --> 00:05:26,007
garisan Selari ( // )

44
00:05:26,130 --> 00:05:37,280
dan garisan Serenjang (⊥).