Solution: let this analytical formula be y = kx+b.

Substitute (1, -2) (-3, -9) into y = kx+b.

Get:-2 = 1k+b

-9=-3k+b

Solution:

K = 7/4 (7/4)

B = 2/7/4 (2 and 7/4)

So the analytical formula is y = 7/4 x+2/7/4.

(abbreviated as y = 7/4 x+7/ 15) hint that x should not be written as a multiplication sign.

2. From the translation of the meaning of the question, we can know that K remains unchanged.

After (2, 7)

Replace y = 7/4 x+b with (2,7).

Get: 7 = 2 times 7/4+B.

Solved: b = 14/4

The analytical formula of the translated line L is: y = 7/4x+ 14/4.

3. Find the coordinates when the vertical and horizontal coordinates are 0.

Substitute abscissa 0 into y = 7/4 x+2/7/4.

Y = 7/4 times 0+2/7/4.

Get y = 2/7/4.

The coordinates are (0,2/7/4)

Substitute the ordinate 0 into y = 7/4 x+2/7/4.

0=7/4x+2/7/4

7/4x=-2/7/4

x=-2/ 1/7

The coordinate is (-2/1/7,0).

Multiply -2/ 1/7 by 2/7/4, and then divide by 2, and the area of the triangle is -4/ 1/56.

4. When x is less than 0, y is greater than 0.

5.x is greater than or equal to 1/4.

X is less than or equal to 43/4.

Next question.

1, m = 1 (ask if you don't understand)

2. It decreases with the increase of x, which means it passes through 1 and 3 quadrants.

M should be less than 1.

3、

M is greater than 1

It's purple, it's late, maybe the back is wrong, because it's late,

88

Author: mysterious sister love

Sauce purple! 88