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1. =
=
1(y - 1) = 3(x - 1)
y - 1 = 3x -3
y = 3x - 2 (A)
2. (gak jelas soalnya)
3. y - y₁ = m(x - x₁)
y - 3 = 2(x - 1)
y - 3 = 2x - 2
y = 2x + 1 (C)
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 1) / (4 - 1) = (x - 1) / (2 - 1)
(y - 1) / 3 = (x - 1)
y - 1 = 3x - 3
y = 3x - 2 (A)
2.
x + 2y ± 3 = 0
2y = -x ± 3
y = -1/2x ± 3/2
m1 = -1/2
Tegak lurus:
m1 . m2 = -1
-1/2 . m2 = -1
m2 = 2
ax + 3y + 2 = 0
3y = -ax - 2
y = -1/3ax -2/3
Karena m2 = 2, maka
-1/3a = 2
a = -6 (D)
3.
y - 2x + 1 = 0
y = 2x - 1
m = 2
(y - y1) = m(x - x1)
(y - 3) = 2 . (x - 1)
y - 3 = 2x - 2
y = 2x + 1 (C)
Semoga membantu :)