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Bx-Ay+D=0 prosta prostopadla
3x+2y+1=0 prosta P=(3 , -1)
2*3+(-3)*(-1)+D=0
6+3+D=0
D=-9
2x-3y-9=0 prosta prostopadla do zadanej , zawiera P
3x + 2y + 1 = 0
2y = -3x - 1
y = -(3/2)x - 1/2
a = -(3/2)
prosta l:
a = 2/3
-1 = 3 * 2/3 + b
-1 = 2 + b
b = -3
y = (2/3)x - 3