Solve the system using addition and put the answer in orderd pair X-5.5y=-18.5
-x+3.3y=11.9

Ineed with number 17 i don’t get it at alll

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

Find the measure of the missing angle