B8
B8 , :
- x0,
- ( ),
- ( ).
, , , . , , , .
, .
B8, : , , , .
.
f(x), x0, , :
- : . A (x1; y1) B (x2; y2). , .
- , Δx = x2 − x1 Δy = y2 − y1.
- , D = Δy/Δx. , .
: A B , f(x), . .
- . y = f(x) x0. f(x) x0.
. A (−3; 2) B (−1; 6) :
Δx = x2 − x1 = −1 − (−3) = 2; Δy = y2 − y1 = 6 − 2 = 4.
: D = Δy/Δx = 4/2 = 2.
: 2
- . y = f(x) x0. f(x) x0.
. A (0; 3) B (3; 0), :
Δx = x2 − x1 = 3 − 0 = 3; Δy = y2 − y1 = 0 − 3 = −3.
: D = Δy/Δx = −3/3 = −1.
: −1
- . y = f(x) x0. f(x) x0.
. A (0; 2) B (5; 2) :
Δx = x2 − x1 = 5 − 0 = 5; Δy = y2 − y1 = 2 − 2 = 0.
: D = Δy/Δx = 0/5 = 0.
: 0
: OX, . .