Abike shop mountain bikes for a $3.50 insurance charge plus $2.50 each hour. for how many hours can a person rent a bike with 21.00

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

Give me the equations of two lines that have the same slope but are not parallel.

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost