Lines s and t are perpendicular if the slope of line s is 5 what is the slope of line t

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

Can someone explain to me how to do

Write a similarity statement for the similar triangles. afgh ~ a