Questions about primary functions, there are questions about primary functions

Solution: Substitute x=-1,y=4 x=3,y=6 into y=kx+b.

k+b=43k+b=6

If k=b= is solved, then the value of kb is .

Because it is a primary function, k is not equal to 0

So we just have to talk about the case of k>0 and k<0.

When k>0 the function is an increasing function, so.

When x=-1, the corresponding y=4, so -k+b=4x=3, the corresponding y=6, so 3k+b=6 can be combined to get k= b=, when k<0, the function is a subtraction function, so.

When x=-1, the corresponding y=6, so -k+b=6x=3, the corresponding y=6, so 3k+b=4, and the same can be obtained by concluding k= b=

by"A function is known once"Getting k is not equal to 0

k>0 y increases with x.

So when x=-1 corresponds to y=4

x=3 corresponds to y=6

Substituting y=kx+b respectively to obtain k= b=

When k<0 y decreases as x increases.

So when x=-1 corresponds to y=6

x=3 corresponds to y=4

Substituting y=kx+b respectively to obtain k= b=

When we know that the primary function y=kx+b is -1 x 3, the corresponding function value is 4 y 6, then the value of kb is.

y=kx+b(k≠0）

x=(y-b)/k

1≤x≤31≤(y-b)/k≤3

k>0 time -k y-b 3k

b-k≤y≤3k+b

Get. b-k=4

3k+b=6

k=,b=k<0 at 3k y-b -k

3k+b≤y≤b-k

Get. 3k+b=4

b-k=6k=,b=

k>0, the corresponding points are (-1,4)(3,6).

k=1/2,b=9/2 kb=9/4

k<0, and the corresponding points are (-1,6)(3,4).

k=-1\2,b=11/2 kb=-11/4

When x=1, y=2 brings 3=k+b 3-k=b

When x=-1, y=1 brings people -k+b=1 -k+3-k=1 k=1 b=2

The y=x+2 function goes up by (0,2) points.

a< a+1, so y1

（1）y=4(x-50)

y=4x-200

2) There are 50 small five stars, so there are red flowers 50 + 50 = 100 (pots) and yellow flowers = 4 * (90-50) = 4 * 50 = 200 (pots).

(1) You can set an unknown quantity, and set z pentagrams, then x=50+z, and y=4z, and the substitution can get y=4x-200

2) Bring in the above formula, 100 pots are used for the red ones, and 200 pots are used for the yellow ones.

1) Select D according to the topic.

b = 32 = k + b to get k = -1

Thereupon. x+3=0

x=32).

Substituting a and b into y=kx+b respectively gives -2=-k+b and.

0=-2k+b, which is solved by two equations, k=-2, b=-4, so the inequality is 2x<-2x-4<0 is solved to x<-2

The coordinates of the intersection are (2,4).

Because 7x-3y=2 can be written as y=7 3x-2 3, and 2x+y=8 can be written as y=8-2x

Then the solution of this system of binary equations is the coordinates of the intersection of y=7 3x-2 3 and y=8-2x.

Welcome to ask thank you.

o(∩_o~

First of all, it should be clear.

The coordinates of the intersection of two lines should satisfy the analytic formula of the two lines.

And the primary functions y=7 3x-2 3 and y=8-2x are actually simplified.

7x-3y=2 vs. 2x+y=8

So the intersection coordinates are (2,4).

(1) The above table reflects the relationship between the estimated annual profit and the required funds, which are the independent variable and the estimated annual profits, which are the dependent variables. If you invest in a project of 400 million yuan, then its annual profit is expected to be 10 million yuan (.).

a(-2,0) is photographed into y=2x+a and y=-x+b, and a and b are 4 and -2

a(-2,0) b(4,0) c(0,-2)

s=(1\2)*2*6=6