Write the equations included in the same set of related facts as 6x8=48

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

Pranza plotted point a in the coordinate plane below.

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.