2x+y-1=0
trecem la forma explicita
y=-2x+1
toatedreptele paralele cyu ea vor avea panta -2
dreapta catre trece prin A(4;3) si are panta -2 are ecuatia
y-3=-2(x-4)
y-3=-2x+8
y=-2x+11
sau in forma implicita
2x+y-11=0
n=17,
ptca Cde n luatecate 1=n
sau
n!/(1!(n-1)!)=17
((n-1)!*n)/(n-1)!=17
n=17 as simple as that!!
