I don't know what is going on in math right now-

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Which expression will have the same sum as 3_8 + 1/4?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?