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3. A = A' - T = (- 2 - 3 , 1 - 5) = (- 5 , - 4)
19. x₁x + y₁y = r²
- 3x + 2y = 13
memotong sumbu y maka x = 0
2y = 13
y = 13/2
(0 , 13/2)
20. x² + y² + 3x + 4y - 12 = 0
(x + 3/2)² + (y + 2)² = 18 3/4
(x₁ + 3/2)(x + 3/2) + (y₁ + 2)(y + 2) = 18 3/4
(0 + 3/2)(x + 3/2) + (2 + 2)(y + 2) = 18 3/4
kalikan 2 semuanya:
3x + 9/2 + 8y + 16 = 75/2
memotong sumbu x maka y = 0
3x + 16 = 33
3x = 17
x = 17/3
(5 2/3 , 0)
3. A'(-2,1) --> T(3,5) --> A(-5,-4)
5. A(13,-4) --> T(-6,2) -->A'(7,-2)