Solve the systems of equations through elimination, show work
8x+y=-16
-3x+y=-15

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

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?

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days