Question 1005456
You can add the two equations to get,
{{{y-x+x+y=-9+12}}}
{{{2y=3}}}
You can then solve for a unique x.
a)So there is a unique solution.
The equations are neither dependent nor inconsistent.
b) Intersecting lines.
One line would be a dependent system.
Parallel lines would be inconsistent system.
c) One solution.
No solution - Inconsistent
Infinite number - Dependent