In circle p, xy = 2.4 cm. what is the circumference of the circle?

4.8pi

Step-by-step explanation:

This applies if the question is asking you to answer in terms of pi!

C = r x p x 2

The problem wants your answer to include pi so just multiply 2.4 times 2.

To answer the problem above, it is best to use the elimination method. We can add up the linear equations to eliminate y. This is shown below,
 
                                               2x + y = 1
                                           +  3x - y = -6

This results to, 
                                               5x = -5

which when simplified gives x = -1. 
Substituting this value of x to any of the equation,

                                               2(-1) + y = 1

                                                     y = 3

Thus, the solution to these linear equations is (-1, 3).