1. , b= -3 60˚.
:
y=kx+b. b= -3, k = tg α= tg 60˚=Ö3. , = -3 .
: = -3.
2. k b :
1) 3 +4 =12;
2) 2 +3 =0;
3) =-2;
4)
:
1) 3 +4 =12; 2) 2 +3 =0; 3) y =-2; 4) ;
4 =12-3 ; 3 y =-2 x; k= 0, b= -2. ;
= ; y = ; y =4- ;
y= ; k = , b =0. y =- ;
y= ; k = , b =4.
k = , b =3.
: 1) k = , b =3; 2) k = , b =0; 3) k= 0, b= -2; 4) k = , b =4.
3. (-1;1), (1;5), (3;-2). .
:
2- :
: ; BC: ; AC: ;
; ; ;
. . .
: : ; : ; : .
4. 2 +3 -3=0 0(1;-2). , 0: ) ; ) .
:
1- .
) k 1= k 2.
y=k 2 x + b 2; 3 y =3-2 x; y = ; k 1= Þ k 2= ; = b 2. 0(1;-2) , -2= 1+ b 2Þ b 2=-2+ , b 2= . , y = Û3 +2 +4=0.
) k 1 k 3=-1.
y=k 3 x + b 3; k 1= Þ k 3 Þ k 3= ; y= x + b 3. 0(1;-2) , -2= 1+ b 3Þ b 3=-2 Þ b 3= .
, Þ3 x -2 -7=0.
2- .
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. |
0(1;-2) |
.2 |
) 2 +3 -3=0 . , (.2). 0(1;-2), , , ( 0, 0) . (- 0)+(- 0)=0, 2( -1)+3( +2)=0, 2 +3 +4=0.
) l 1 (.3) l, l 1, .
|
|
l |
l 1 |
2 +3 -3=0 |
. |
(1;-2) |
.3 |
, ( 0, 0) . . . ; 3 -3=2 +4, 3 -2 -7=0.
: 2 +3 +4=0, 3 -2 -7=0.
2. 0(2;-1) 3 +4 -22=0.
:
; 0=2; 0=-1.
=3; =4; =-22.
.
: 4.