In the equations 3x + 2y = 13xy  and 4x - 5y = 2xy, the value of x and y satisfy that the equations are

1)  ( 2, 3 )
2)  ( 3, 2 ) 
3)  ( 1/2, 1/3 ) 
4)  ( 1/3, 1/2 )

A man can row three quarters of a km against the stream in   minutes and return in  minutes. The speed of man in still water is: 

1) 2 km/h  
2) 3 km/h 
3) 4 km/h 
4) 5 km/h   

If the system of equations

                        2x + 3y = 7

                        2ax + (a + b)y = 28

has infinitely many solutions, then ________.

1)  a = 2b 
2) b = 2a 
3) a + 2b = 0 
4) 2a + b = 0

If  x-y = 3 and x + y ≥ 9 the least value of  x is:  

1) 6  
2) 3 
3) 2 
4) 1

The system of equation  x +2y =6 , 3x + 6y = 18

1) Is inconsistent  
2) Has an infinite number of solution  
3) Has a unique solution
4) None of these