Find the missing coordinate to complete the ordered-pair solution to the given linear equation: 3x-4y=6

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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

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?