Cho lược đồ quan hệ R(ABCDEI) và tập phụ thuộc hàm: F=\DAB=E. BI = ECDIE→c xác dịnh trên R. Chứng minh rằng: AB → ECD theo hai cách:

a. Cách 1: Dựa vào tính chất của hệ tiên đề Armstrong
b. Cách 2: Sử dụng bao dóng.

parallel and congruent

step-by-step explanation:

the movement of translation is linear.   these have the same translation because you are using the same rule for each point of the triangle so you will see the same slope being used to get from a point on the triangle to its image.

same slope!   you should think parallel when you see those 2 word together (well unless it's the same line but it can't be because we are coming from different points here)

congruent! because each point is being moved the same distance.

you need to show us the graph.

step-by-step explanation: