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y = 3/2x +3
y = 1 1/2 x +3
l: y = 1 1/2 x +b
P(6,0) ∈ l więc
0 = 1 1/2 * 6 + b
0 = 3/2 *6 + b
0 = 9 +b
-9 = b
b = -9
l: y = 1 1/2 x -9 równanie kierunkowe
1 1/2x-y -9 =0 równanie ogólne