The equation x + 2y + 2z = 1 and 2x + 4y + 4z = 9 have

1) Only one solution

2) Only two solutions

3) Infinite number of solutions

4) None of these.  

Determine, without graphing, whether the System of equations has exactly one solution, no solution, or an infinite number of solutions.
3x - 9y = 6

y=1/3 x -2/3

How many solutions does this linear system have?

a. one solution:  

b. one solution:  

c. no solution

d. infinite number of solutions

Please show full working out and rightsolution please