I need help with Geometry Please help me

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

10x − 5y + 14 = 0 whats the answer pls

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint