Does anyone know how to do this?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

What is the interquartile range (iqr) of the data set represented by this box plot?

Consider a= {x|x is alive} f={x|x is in france} m={x|x is a national monument} w{x|x is a woman}. which statements are true regarding elements of the given sets? check all that apply.