Which of the following systems of equations has infinitely many solutions?
A) x+y=1
x-y=1
B) -2x + y = 1
-2x + y = 5
1 1
C) - x - y =1
2 3
3x – 2y = 6
D) 2x + 3y = 1
3x – 2y = 1

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

Evan walked 5/8 mile to his friends house.then together they walked 7/12 mile to the movie theatre.which pair of fraction can evan use to find how far he walked in all?