Name the two cases of functions that do not have an all real domain

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

X+ y = 5 ; x - y =3 solve using linear combination