Can someone please help me out?

What can you determine about the solutions of this system

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?