[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:00.98,Default,,0000,0000,0000,,문제입니다
Dialogue: 0,0:00:00.98,0:00:05.07,Default,,0000,0000,0000,,다음 점들을 포함하는 직선의\N기울기는 무엇일까요?
Dialogue: 0,0:00:05.07,0:00:07.44,Default,,0000,0000,0000,,강의를 멈추고\N같이 풀어보기 전에
Dialogue: 0,0:00:07.44,0:00:10.06,Default,,0000,0000,0000,,스스로 해보세요
Dialogue: 0,0:00:10.06,0:00:11.76,Default,,0000,0000,0000,,좋습니다\N같이 풀어봅시다
Dialogue: 0,0:00:11.76,0:00:14.27,Default,,0000,0000,0000,,기울기가 무엇인지\N상기시켜 봅시다
Dialogue: 0,0:00:14.27,0:00:19.06,Default,,0000,0000,0000,,기울기는\N분자는 y의 변화량
Dialogue: 0,0:00:19.06,0:00:21.09,Default,,0000,0000,0000,,이것은\N그리스 문자 Δ 입니다
Dialogue: 0,0:00:21.09,0:00:21.98,Default,,0000,0000,0000,,삼각형처럼 생겼죠
Dialogue: 0,0:00:21.98,0:00:24.41,Default,,0000,0000,0000,,y의 변화량을 나타내는\N기호입니다
Dialogue: 0,0:00:24.41,0:00:27.37,Default,,0000,0000,0000,,분모는\Nx의 변화량입니다
Dialogue: 0,0:00:27.37,0:00:31.52,Default,,0000,0000,0000,,(y₂ - y₁) / (x₂ - x₁)를\N본 적이 있죠
Dialogue: 0,0:00:31.52,0:00:34.81,Default,,0000,0000,0000,,(y₂ - y₁) / (x₂ - x₁)를\N본 적이 있죠
Dialogue: 0,0:00:34.81,0:00:37.61,Default,,0000,0000,0000,,x₁과 y₁은 시작점이고
Dialogue: 0,0:00:37.61,0:00:40.86,Default,,0000,0000,0000,,x₂와 y₂는 종점입니다
Dialogue: 0,0:00:40.86,0:00:44.79,Default,,0000,0000,0000,,두 xy 쌍을 골라봅시다
Dialogue: 0,0:00:44.79,0:00:46.14,Default,,0000,0000,0000,,임의의 두 점을 고르면
Dialogue: 0,0:00:46.14,0:00:49.12,Default,,0000,0000,0000,,직선을 나타낼 수 있습니다
Dialogue: 0,0:00:49.12,0:00:51.10,Default,,0000,0000,0000,,앞에 있는 두 점을 골라
Dialogue: 0,0:00:51.10,0:00:52.89,Default,,0000,0000,0000,,시작점과 종점이라고 합시다
Dialogue: 0,0:00:52.89,0:00:54.33,Default,,0000,0000,0000,,시작점과 종점이라고 합시다
Dialogue: 0,0:00:54.33,0:00:56.69,Default,,0000,0000,0000,,x의 변화량은 얼마일까요?
Dialogue: 0,0:00:56.69,0:00:59.22,Default,,0000,0000,0000,,2에서 3으로
Dialogue: 0,0:00:59.22,0:01:03.09,Default,,0000,0000,0000,,x의 변화량은\N3 - 2 = 1 입니다
Dialogue: 0,0:01:03.09,0:01:03.95,Default,,0000,0000,0000,,x의 변화량은\N3 - 2 = 1 입니다
Dialogue: 0,0:01:03.95,0:01:05.55,Default,,0000,0000,0000,,2에서 3으로
Dialogue: 0,0:01:05.55,0:01:06.74,Default,,0000,0000,0000,,1을 더했습니다
Dialogue: 0,0:01:06.74,0:01:08.18,Default,,0000,0000,0000,,y의 변화량은 얼마일까요?
Dialogue: 0,0:01:08.18,0:01:10.91,Default,,0000,0000,0000,,종점의 y값 1에서
Dialogue: 0,0:01:10.91,0:01:15.00,Default,,0000,0000,0000,,시작점의 y값 4를 뺀\N-3 입니다
Dialogue: 0,0:01:15.00,0:01:16.97,Default,,0000,0000,0000,,수학적으로 생각할\N필요가 없습니다
Dialogue: 0,0:01:16.97,0:01:17.80,Default,,0000,0000,0000,,2에서 3으로
Dialogue: 0,0:01:17.80,0:01:19.61,Default,,0000,0000,0000,,1을 더했고
Dialogue: 0,0:01:19.61,0:01:22.60,Default,,0000,0000,0000,,4에서 1로\N3을 뺐습니다
Dialogue: 0,0:01:22.60,0:01:25.05,Default,,0000,0000,0000,,필요한 정보를 확보했습니다
Dialogue: 0,0:01:25.05,0:01:27.80,Default,,0000,0000,0000,,Δy/Δx는 무엇일까요?
Dialogue: 0,0:01:27.80,0:01:29.40,Default,,0000,0000,0000,,Δy는 -3이고
Dialogue: 0,0:01:29.40,0:01:31.56,Default,,0000,0000,0000,,Δy는 -3이고
Dialogue: 0,0:01:31.56,0:01:33.08,Default,,0000,0000,0000,,Δx는 1입니다
Dialogue: 0,0:01:33.08,0:01:34.100,Default,,0000,0000,0000,,따라서 기울기는\N-3/1 = -3 입니다
Dialogue: 0,0:01:34.100,0:01:37.01,Default,,0000,0000,0000,,따라서 기울기는\N-3/1 = -3 입니다
Dialogue: 0,0:01:37.01,0:01:39.86,Default,,0000,0000,0000,,다른 예제를 풀어봅시다
Dialogue: 0,0:01:39.92,0:01:42.74,Default,,0000,0000,0000,,이 점들을 포함하는 직선의
Dialogue: 0,0:01:42.74,0:01:45.32,Default,,0000,0000,0000,,기울기는 얼마일까요?
Dialogue: 0,0:01:45.32,0:01:47.41,Default,,0000,0000,0000,,강의를 멈추고\N스스로 풀어보세요
Dialogue: 0,0:01:47.41,0:01:50.72,Default,,0000,0000,0000,,강의를 멈추고\N스스로 풀어보세요
Dialogue: 0,0:01:50.72,0:01:52.76,Default,,0000,0000,0000,,좋아요\N기억하세요
Dialogue: 0,0:01:52.76,0:01:57.60,Default,,0000,0000,0000,,기울기는\NΔy/Δx 입니다
Dialogue: 0,0:01:57.61,0:02:00.23,Default,,0000,0000,0000,,직선을 구하려면
Dialogue: 0,0:02:00.23,0:02:01.99,Default,,0000,0000,0000,,임의의 두 점을\N골라야 합니다
Dialogue: 0,0:02:01.99,0:02:03.51,Default,,0000,0000,0000,,임의의 두 점을\N골라야 합니다
Dialogue: 0,0:02:03.51,0:02:07.71,Default,,0000,0000,0000,,다양성을 위해서\N중간의 두 점을 고릅니다
Dialogue: 0,0:02:07.71,0:02:09.73,Default,,0000,0000,0000,,Δx는 얼마일까요?
Dialogue: 0,0:02:09.73,0:02:12.26,Default,,0000,0000,0000,,1에서 5로\N4를 더했습니다
Dialogue: 0,0:02:12.26,0:02:13.73,Default,,0000,0000,0000,,Δy는 얼마일까요?
Dialogue: 0,0:02:13.73,0:02:16.92,Default,,0000,0000,0000,,7에서 13\N6을 더했습니다
Dialogue: 0,0:02:16.92,0:02:22.74,Default,,0000,0000,0000,,Δy는 6이고\NΔx는 4입니다
Dialogue: 0,0:02:22.76,0:02:25.96,Default,,0000,0000,0000,,두 값 모두 양수입니다
Dialogue: 0,0:02:25.97,0:02:28.29,Default,,0000,0000,0000,,x가 증가하면\Ny도 증가합니다
Dialogue: 0,0:02:28.29,0:02:29.56,Default,,0000,0000,0000,,따라서 기울기는 6/4 입니다
Dialogue: 0,0:02:29.56,0:02:31.25,Default,,0000,0000,0000,,간단히 나타내면
Dialogue: 0,0:02:31.25,0:02:33.04,Default,,0000,0000,0000,,6과 4 모두\N2로 나누어지므로
Dialogue: 0,0:02:33.04,0:02:35.28,Default,,0000,0000,0000,,분자와 분모를\N2로 나누면
Dialogue: 0,0:02:35.28,0:02:38.14,Default,,0000,0000,0000,,3/2이 나옵니다