3,2, 1.a，b. (3b- 1)/2

The independent variable is the initial variable. This function describes the correspondence between each input value and a unique output value. The function value is the value of the function dependent variable y.

2.d (because y corresponding to x has two values)

Example 3. D (because x corresponds to y with two values)

123. 124

One, three, four. Two three four

Example 1

y=-2x+3，y=0，x=3/2。

y=x-3，y=0，x=3

2x+3=x-3，x=2，y=- 1

1/2x(3-3/2)x 1=3/4

Example 2

( 1) x=-4，y=-2x(-4)-6=2。 xy=-2x^2-6x=-2？ X=(-3+/- radical sign 13)/2 {if y=-2, the value of x should be -2x-6 =-2 and X =-2}.

(2)?

(3) It seems that the title is typed wrong.

-4 & lt； =-2x-6 & lt； =2，-4 & lt； = x & lt=- 1

D (the inverse proportional function can also be linear)

I think it's 2?

B

A

D

D

A

(0,-3)

y= 1/2x

m & lt=0

k=- 1，b= 1

y=-2/3x

four

(3/2,0) (0, -3) One, three, four, increase.

4,< Four

32/5, 49

y=-x+ 1

y=-x+2

y=-5x+500，0 & lt= x & lt= 100

( 1)S=40-4x

(2)0 & lt； x & lt 10

(3) x=7，y=3

(4)