How do i tell whether the ordered pair is a solution of the given system ? {3x+y=4 and x-3y=-4

You plug the x and y values back into both equations. If both come out to be true statements ie. 4=4, 7=7 your answer is correct. If one or both of the equations turn into false statements, the ordered pair is not the solution to the system.

32.10 is the correct answer

45 this is because of the agarose