5.
.
: .
.
(). , , , . .
, , .
F(x,y)=0 y=f(x), F(x,y) f(x) .
(,) , . (,) ( , ).
. , (-4, 2) (-2, -6).
. (,) . : =, , 2=2.
, .
=
- .
( ). , .
. - (0,0)
- .
, (,) F(x,y)=0, , .
: .
(0; b) a. () (. . 4.3).
(, ), N:
,
kx=y-b, Þ y=kx+b (*)
, (*)
, , (*). , , , (*).
(*) .
(*).
1. b = 0, = kx , k= tg>0 , k=tg < 0 (. .).
2. a=0, k =tg0=0 , , = b, = 0 (. .).
3. , (. . 2) , . . . , , . , = ( ), =0.
.
1. y=kx+b . (1 ) k=tga - ,
b ,
2. , ( ).
|
|
1( 1, 1) , (1), . .
y1=kx1+b (**)
(1) (**),
-y1=k(-x1)+b (2)
(2) - .
k , (2) - , 1( 1, 1)
. , (3;-2) ). 1350 ). ).
3. , .
1(1,1), 2(2,2) 1¹ 2, 1¹ 2
12 (. 4.10) , 1:
-y1=k(-x1)+b
2(2,2) , , 2
2-y1=k(2-x1)+b
(3)
. , (-5; 4) (3; -2).
4. .
¹0 b ¹0. (, 0) B(0, b). (3),
(4)
(4) .
5. .
+ + = 0, (5)
, .. 2 + 2¹ 0.
1. ^ 0. (5)
, .
). ¹ 0, ¹ 0, =k+b ( );
). ¹0, =0, y = kx ( , );
). =0, = 0, =b ( , );
). =0,=0, = 0 ( ).
2. = 0, ¹ 0. (5)
.
). ¹ 0, = ( , );
). = 0, = 0 ( ).
, , , (5)
(5) .
, (2) (5) , .
.
1. .
y=k1x+b1 ()
y=k2x+b2 ()
j .
, j=a2-a1.
k1= tg a1, k2= tg a2,
, .
(1)
.
() () , j=0 tgj=0. (1) , k2-k1=0, ..
k2=k1 (2)
(2) .