How do i do this? i do not understand it at all

Use elimination for number 2( multiply the bottom one by -1 the entire equation then add once you have the equation solve the equation to find x once you find x plug it in the top equation to ding y)(for substitution there should be a equation y= #x+or- # plug the part after the y into the other equation once you find x plug it in to the starter equation and go from there)(hope this helps)

C4 i’m pretty sure