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2.y=- 1/2x y=2x+5

X=-2 y= 1 B(-2， 1)。

3.2x+5=0 x=-5/2 A(-5/2，0)

x=0 y=5 C(0，5)S= 1/2*5/2* 1=5/4

4.y 1 =- 1/2x 1 Y2 =- 1/2 x2

y 1-Y2 =- 1/2(x 1-X2)>0y 1 & gt； Y2

5.Case 1bo = bobo = radical number 5 P (radical number 5,0) p (-radical number 5,0) (0,5) (0,5).

Case 2 bo = pbp (0,2) (-4,0)

In the case of 3bp=po bo, the vertical line is y=2x+5/2.

p(0，5/2) (-5/4，0)

6. because OC is the y axis, the abscissa of q is twice that of b.

X=-4 or 4

Q( -4，2) (-4，-3) (4，-2) (4， 13)