Create an equivalent system of equations using the sum of the system and the first equation. −3x + y = 12 x + 3y = 6 −3x + y = 12 −2x + 4y = 18 −3x + y = 12 −3x + 4y = 18 −3x + y = 12 x + 4y = 18 −3x + y = 12 −2x + 4y = 6.

Zachary has been trying to work on an essay for almost three hours, be he can't seem to focus for more than 15 or 20 minutes at a time. what should he do so that the quality of his work doesnt suffer because of poor concentration and lack of energy