I go to the first class of lyceum and I have to solve the systems in algebra:

x+y=-1

2x+2y=-2

and another one:

x+2y=13

3x+y=4

Please help me with the mathematics.

Thanks a lot.

Pigaino stin proti lukeiou kai prepei na luso ta sustimata stin algebra:

x+y=-1

2x+2y=-2

kai akomi ena:

x+2y=13

3x+y=4

Parakalo boithiste me sta mathimatika.

Euxaristo polu.