Question

Please help. Will medal and fan

Answer 1

they say
equation 1 is replaced with the sum of equation 1 and a multiple of equation 2,
equation 2 is multiplied by 1

in other words, they are thinking : add equation 1 and equation 2
can you do that ?

Answer 2

yes. look for that result for the correct choice.
(and of course, the second equation stays the way it was)

Answer 3

and remember -1y can be written - y

Answer 4

ok cool