Răspuns:
Explicație pas cu pas:
f : R --> R ; f(x) = -2x+5
a) f(x) = 0 <=> -2x+5 = 0 => 2x = 5 => x = 5/2 =>
A(5/2 ; 0)
b) ax+by+c = 0 ; y = -2x+5 => -2x-y+5 = 0
m = -a/b = -(-2)/(-1) = -2 => m = -2
c) x = 0 => f(0) = 5 => B(0 ; 5) ;
x = 1 => f(1) = 3 => C(1 ; 3) ;
x = 2 => f(2) = 1 => D(2 ; 1)
