HuRRRConsider the following four linear equations: I. 2x - 3y = -15
II. x+ 3/2y = 6
III. 3x + 2y = 8
IV. 15x + 5y = -40
Which of the above lines are perpendicular?

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