1, y=k/x(k is a constant and k? 0)

y=kx- 1 xy=k

2.( 1)y contains a fraction of the independent variable X.

(2)k？ 0

(3) All non-zero real numbers

(4) All non-zero real numbers

3.( 1)① List

② Tracking point

③ Connection

(2) hyperbola

Two unconnected branches, the extension gradually approaches the coordinate axis, but never intersects the coordinate axis.

(3)y=x y=-x origin

(4) Draw a vertical line between the Z axis and the Y axis from any point on the hyperbola, and the rectangular area is ∣x∣.

4, 1, 3 quadrants In each quadrant, y decreases as x increases by two,

There are four quadrants in each quadrant, and y increases with the increase of X.

5.( 1) undetermined coefficient method

6. Cylindrical volume problem, engineering problem, lever problem and electric power problem.

The bottom area s of (1) cylinder is height (depth) d.

(2) working time t working efficiency v

(3) power f power arm l

(4) power supply p resistance r

Review exercises

1、C

2、B

3、B

4、-3

5、2

6、-3

7. When x1< 0 <; X2，y 1

? Point A is in the third quadrant and point B is in the first quadrant.

? The hyperbola is distributed in the first and third quadrants. 1-2m & gt； 0,

? m & lt 1/2

8 、( 1)m=-4，k=- 8

(2)k & lt； -9