Центр гомотетии Q(x;y)
Коэффициент гомотетии k = -1/3
QM = k*QN
(6;-3) - (x;y) = k*((2;1) - (x;y))
(6;-3) - (x;y) = -1/3*((2;1) - (x;y))
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по координате Х
6 - x = -1/3(2 - x)
6 - x = -2/3 + x/3
18 - 3x = -2 + x
20 = 4x
x = 5
по координате Y
-3 - y = -1/3*(1 - y)
-9 - 3y = -1 + y
-8 = 4y
y = -2
Q(5;-2)
Центр гомотетии Q(x;y)
Коэффициент гомотетии k = -1/3
QM = k*QN
(6;-3) - (x;y) = k*((2;1) - (x;y))
(6;-3) - (x;y) = -1/3*((2;1) - (x;y))
---
по координате Х
6 - x = -1/3(2 - x)
6 - x = -2/3 + x/3
18 - 3x = -2 + x
20 = 4x
x = 5
---
по координате Y
-3 - y = -1/3*(1 - y)
-9 - 3y = -1 + y
-8 = 4y
y = -2
---
Q(5;-2)