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y = ax + b
6 = 3a + b
-1 = -2a + b
b = 2a - 1
6 = 3a + 2a -1
5a = 7
a = ⁷/₅
b = ¹⁴/₅ - 1 = ⁹/₅
y = ⁷/₅x + ⁹/₅
2. Równoległa
a₁ = a
y = 4x + b
-¹/₃ = 12 +b
b = -13¹/₃
y = 4x -13¹/₃
Prostopadła
4*a₂ = -1
a₂ = -¹/₄
y = -¹/₄x + b
-¹/₃ = -³/₄ + b
b = ³/₄ - ¹/₃ = ⁹/₁₂- ⁴/₁₂ = ⁵/₁₂
y = -¹/₄x + ⁵/₁₂