Quadritic - Linear equations

Hey guys, this is mehtab. Today, we experienced some problems in our worksheet. So, Mr.P helped us. For e.g i got stuck at the first one. The equation was :

We just have to use the substitution method. First take the simplest equation, and take 1 variable on one side and rest of them to the other side. In here x+y=-3 is the easiest one. So, take y on one side and rest of them to the other. Therefore, it would be y= -3-x. Now, substitute y in equation 2. You will get the value of x after that. Then you write it in an ordered pair. And there you go, you are done. NO NEED TO THANK ME, IT'S MY JOB. ;)