Please help I need this in less than an hour

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Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

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?