Xavier has xx nickels and yy pennies, having no more than 20 coins worth at least $0.40 combined. A minimum of 10 of the coins are nickels and a maximum of 4 of the coins are pennies. Solve this system of inequalities graphically and determine one possible solution.

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