Zadania w załączniku.
+ Równanie okręgu
+ Równanie prostej prostopadłej
+ Równianie prostej równoległej
4.
A = (5, -1) B = (-7, -3)
Xs = (5 - 7)/2 = -2/2 = -1
Ys = (-1 - 3)/2 = -4/2 = -2
S = (-1, -2) ------------ srodek okregu
r = 8
(x+ 1)² + (y + 2)² = 8²
odp. (x+ 1)² + (y + 2)² = 64
5.
y = -6x + 1 _|_ y = ax + b ⇔ -6 * a = -1
a = 1/6
y = 1/6x + b i A = (-6, 2)
x y
2 = 1/6 * (-6) + b
2 = -1 + b
2 + 1 = b
b = 3
odp. y = 1/6x + 3
6.
y = -3x + 1 || y = ax + b ⇔ -3 = a
y = -3x + b i A = (-2, 1)
1 = -3 * (-2) + b
1 = 6 + b
1 - 6 = b
b = -5
odp. y = -3x - 5
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4.
A = (5, -1) B = (-7, -3)
Xs = (5 - 7)/2 = -2/2 = -1
Ys = (-1 - 3)/2 = -4/2 = -2
S = (-1, -2) ------------ srodek okregu
r = 8
(x+ 1)² + (y + 2)² = 8²
odp. (x+ 1)² + (y + 2)² = 64
5.
y = -6x + 1 _|_ y = ax + b ⇔ -6 * a = -1
a = 1/6
y = 1/6x + b i A = (-6, 2)
x y
2 = 1/6 * (-6) + b
2 = -1 + b
2 + 1 = b
b = 3
odp. y = 1/6x + 3
6.
y = -3x + 1 || y = ax + b ⇔ -3 = a
y = -3x + b i A = (-2, 1)
x y
1 = -3 * (-2) + b
1 = 6 + b
1 - 6 = b
b = -5
odp. y = -3x - 5