3 x^2 +30 x +75 factored completely

Aportion of a line bounded by two points is defined as

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15