(5) ¹0, , ,
y=kx+b | (6) |
k=A/B, b=/. , k=tga, a - , . (6) b .
, (0;0)
(7) |
(5) ¹0, ,
x/a+y/b=1 | (8) |
=/, b=/.
. (8) , b . b .
, 1(x1;y1) 2(x2;y2)
(9) |
1.
, b=2 k=3.
:
(6), :
=3 2.
: =3 2.
2.
, =2,5 b=1,5.
:
(8) :
/2,5+/1,5=1.
:
(2/5)+(2/3)=1 6+1015=0.
: 6+1015=0.
3.
25+10=0.
: 1) ;
2) ;
3) .
:
1) , :
5=2+10 =(2/5)+2.
k =2/5; b =2.
2) (10):
2/(10)5/(10)=1.
=5; b=2.
3) :
4.
, (1;5).
:
(9)
;
y=5x;
5x+y=0 .
:
5.
, (2;3)
(4;5).
:
(9) 1=2, 1=3, 2=4, 2=5, :
((3))/(5(3))=(2)/(42) (+3)/8=(2)/(6), 4(2)=3(+3).
4+3+1=0.
: 4+3+1=0
6.
(1;1), (5;7), (9;3).
D, BE, CN.
:
D (4):
=(59)/2=2;
=(7+3)/2=5,
. . D(2; 5).
AD , :
( 1)/(51)=( +1)/(2+1) ( 1)/4=( +1)/(1),
. . 4 + +3=0.
: AD 4++3=0.
CN .
y1=k1x+b1 y2=k2x+b2
tga=(k2k1)/(1+k2k1) | (10) |
|
|
, , ..
k 2= k 1.