Divide 48 pieces of clothing into two groups so that the ratio is 1 to 3

Solve the system of equations. y= 2x y= x^2 - 15

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )