exam Maths Puzzle Numerical Ability

Graph each of the following equations by first solving for y.
2x-3y=12

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I am trying to understand increasing and decreasing intervals of quadratic function but I just don't get it -please help. thank you Please, I need some help with these problems. If anyone can help please.

1. {4x+y=13
{2x-y=5

2. {2x+4y=6
{5x+10=15

3. {x+y-z=-1
{-4x-y+2z=-7
{2x-2y-5z=7