Which of the following would be a line of reflection that would map ABCD onto itself? A. y = 1
B. 2x + y = 2
C. x + y = 4
D. x + y = 1

This is the line through points A and C, which is one of the diagonals. Reflecting any square over its diagonal will result in the same figure. We can say it's symmetrical about the diagonal line.

Put another way, reflecting point B over the line x+y = 4 will have it land on point D. Then point D will move to where B used to reside. In short, points B and D swap places. Points A and C will stay fixed in place.

if x decreases by 4 then y increases by 10

step-by-step explanation: