Current location - Training Enrollment Network - Mathematics courses - Who can help me find the answers to all the questions on the eighth grade math page?
Who can help me find the answers to all the questions on the eighth grade math page?
Constants are defined and will not change. Variables can be assigned values after definition.

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)