Solve the system using the elimination method 3x - y=-12
X + y =4

correct answer:

i^31 = -i

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225