M=2/5 (4,-5) point slope

Can someone explain the elimination method to me for this problem?

Write a division equation you could use to find a, the number of miles ava is in charge of. what is the value of a? write your answer is simplist form

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?