Can someone please explain a step to step solution to this question please?

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Construct and interpret a scatter plot of the data collected by a travel agency. if a relationship exists, make a conjecture about the number of visitors in month 12