1. If, and point M(a, b) is in the second quadrant, the coordinate of point m is ().
a 、( 5，4) B 、( 5，4) C 、( 5，-4) D 、( 5，-4)
2. It is known that point A (a, 2) and point B (-1, b) are symmetrical about the Y axis, so the values of a and b are () respectively.
A. 1，2？ B. 1，-2？ C.- 1，2？ D.- 1，-2
3. It is known that in a linear function, the function value y decreases with the increase of the independent variable x, so the value range of m is ().
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A, B, C, D,
4. The image of the linear function is shown in the figure, so the following conclusions are drawn:
① ; ② ; (3) In, the correct number is ()
A.0 B. 1 C.2 D.3
5. In the following groups of functions, the intersection with the y axis is the same as ().
A, y=5x and y=2x+3 B, y=-2x+4 and y=-2x-4.
C, y= +3 and y=-2x+3 D, y=4x- 1 and y=x+ 1.
6. It is the function y=-2x+3, and the following statement is correct ().
A.b.c.d can't judge the size.
7. If the area of the triangle surrounded by the straight line y=-2x+b and the two coordinate axes is 4, then the value of b is ().
a、4 B、-4 C、4 D、2
8. No matter why m is a real number, the intersection of the sum of straight lines cannot be in ().
A. first quadrant B. second quadrant C. third quadrant D. fourth quadrant
9. In the plane rectangular coordinate system, the coordinates of point P (-5, -2) are obtained by translating it to the left by 2 unit lengths and then to the up by 4 unit lengths.
10. In the function, the value range of the independent variable x is.
1 1. Translate the straight line y=2x+ 1 down by 3 units, and the straight line obtained should be _ _ _ _ _ _ _ _ _ _ _ _.
12. It is known that the image of a linear function is parallel to the straight line y=-x+ 1 and passes through the point (8,2), so the analytical formula of this linear function is _ _ _ _ _ _ _ _ _ _ _ _ _.
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13. If the image of the function passes through a point, then the image of the function must not pass through a quadrant.
14. As shown in the figure, straight line: and straight line:
Intersecting at point p (,2), the inequality is about ≥
The solution set of is. www.xkb 1.com
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15. In the plane rectangular coordinate system:
(1) tracing a (-2, -2) in the graph,
B (-8，6)，C (2， 1)，
Connect AB, BC and AC, draw an image, translate it to the left by 1 unit, and then translate it down by 2 units.
⑵ Find the area of ABC.
The first network of new curriculum standards
16. It is known that 2y-3 is proportional to 3x+ 1, and when x=2, y=5.
(1) Find the functional relationship between Y and X, and point out what function it is;
(2) Is the point (3,2) on the image of this function?
(3) If the value of y is 0≤y≤5, find the value range of x.
17. A real estate development company plans to build 80 apartments A and B. The funds raised by the company are not less than 20.9 million yuan, but not more than 20.96 million yuan, all of which are used for building houses. The construction cost and selling price of these two apartments are as follows:
Note: Profit = selling price-cost.
(1) What are the company's architectural plans for these two types of apartments?
(2) How does the company get the maximum profit from building? What is the maximum profit?