Graph the equation y + x = 14

I need help plz

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74