In geometry how you get surface number on a shape with three different measurements

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

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5

Meee i honestly dont know what this question talking about