x y

x + by + c = 0

, b, c , b 0 ( 0 b 0).3x + 2y 1 = 0, x + y 2 = 0

x + by + c = 0

(x0, y0) x x0 y y0 .

x + by + c = 0, 0 b 0, , x + by + c = 0, 0 b 0, .

30 . ? x , y .O .y = x + 30y = 3x

30 . ? x , y .O .y = x + 30y = 3x

x y

1x + b1y = c1 2x + b2y = c2,

1, b1, c1, 2, b2, c2 .

x y (x0, y0) .

1x + b1y = c1 2x + b2y = c2

1x + b1y = c1 2x + b2y = c2 1x + b1y = c1 2x + b2y = c2.

? 3x y = 42x + y = 6.

3x y = 42x + y = 6.

, .

x + y = 1 x + y = 5.

x + y = 1 x + y = 5.

, .

x y = 22x 2y = 4.

x y = 22x 2y = 4

, .

, . , . , .

KRAJ