Answer please?,?

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

How do i put 3(x+7) in distributive property

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