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Another hard question watch

1. I need a point in the right direction on this one, as I'm absolutely stumped. Any ideas?

2. (Original post by thomoski2)
I need a point in the right direction on this one, as I'm absolutely stumped. Any ideas?

Here's a starter. The system of equations will have infinitely many solutions if any of the three equations is a multiple of either of the other two equations. Perhaps have a look at the first and third equations?
3. (Original post by old_engineer)
Here's a starter. The system of equations will have infinitely many solutions if any of the three equations is a multiple of either of the other two equations. Perhaps have a look at the first and third equations?
I've given that a try, but I'm still stumped
4. (Original post by thomoski2)
I've given that a try, but I'm still stumped
I've got as far as row reducing, and then solving using cases, but I'm not sure how to row reduce it
5. Have you tried to find the determinant of non-augmented matrix first of all?
6. (Original post by thomoski2)
I've given that a try, but I'm still stumped
Are there values of a and b for which the third equation is a multiple of the first equation? (Quite a simple integer multiple).

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