Solve the system of equations by graphing -1/3+y=-1

Landon wrote that 3−2.6=4. which statement about his answer is true?

Which of the following circles have their centers in the third quadrant?

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