1.  
2. 
The line
intersects the curve at points
A and B. Find 

(a) the coordinates of points A and B, 

(b) the length of AB. 

3.  Find the equation of the circle whose centre is (1,2) and which passes through 

the point (4,0). 

4.  A circle passes through two points A(1,0)
and B(0,4) and line AB is the diameter 

of the circle. Find the equation of the circle. 

5.  
6.  