Question

Bantulah no 8-11 dengan jawaban yang jelas dan tepat beserta rumus-rumusnya!!!!!!!!

Answer 1

8) A (-5,7)
4y + x - 1 = 0
4y = - x + 1
y = -¼x + ¼
m = -¼
syrat tgk lurus m1 . m2 = -1
m2 = -1/-¼ = 4
pers gris baru
y - y1 = m(x - x1)
y - 7 = 4(x + 5)
y - 7 = 4x + 20
y = 4x + 27 (d)

9) dgmbar dulu grafiknya
jwbnnya (b)

10) 2y + 3x - 15 = 0
2y = -3x + 15
y = -3/2x + 15/2
m = -3/2
syrat sejajar : m1 = m2
y - y1 = m(x - x1)
y - 8 = -3/2(x - 3)
y - 8 = -3/2x + 9/2
-----------------------(×2)
2y - 16 = -3x + 9
2y = -3x + 25 (g ad opsi)

11) mel ttk (-4,-2) dan (6,-7)
pers (y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
= (y + 2)/(-7 + 2) = (x + 4)/(8 + 4)
(y + 2) / (-5) = (x + 4)/ 12
12(y + 2) = -5(x + 4)
12y + 24 = -5x - 20
12y = -5x - 44 (g ad opsi)

12) ½x - 3/5y - 10 = 0
-3/5y = -½x + 10
y = (-½×-5/3)x + 10
y = 5/6x + 10
m = 5/6 (d)