Gabriella's travel shampoo bottle holds 1/2 cup of shampoo. before leaving on vacation, she filled the bottle to the top with 1/8 cup of shampoo. how much shampoo was already in the bottle?
i just need somebody to explain to me how i do this i don't even need the answer
i just need to know how to solve it

there was an already an amount in the bottle, and when 1/8 was added, the amount became 1/2

so

something + 1/8 = 1/2

answer: ur mum is gay

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.