Um.. Both of those equations are the exact same. Divide both sides of the first equation by 6. You get:
[tex] \frac{30x - 42y}{6} = \frac{-6}{6} \\ 5x - 7y = -1 [/tex]
That is the exact same as the second equation. This system has an infinite number of solutions. 5x - 7y = -1 is a line, so basically every point on that line is a solution to the system.
For example, [tex] x = 0 [/tex] and [tex] y = \frac{1}{7} [/tex] would work, but so would [tex] x = 1 [/tex] and [tex] y = \frac{6}{7} [/tex]
