1. ## unique solution

For what values of k will the pair of equations 3x+4y=12 and kx+12y=30 does not have a unique solution .

2. Originally Posted by thereddevils
For what values of k will the pair of equations 3x+4y=12 and kx+12y=30 does not have a unique solution .
Multiply the first equation by 3 and then eliminate the y's.

You should find that $(9-k)x=6$.

For which value of k will make this equation nonsense?

3. Thanks prove it , 9 .....