Can someone please explain how simplify (step by step)

-5.451

Step-by-step explanation:

This problem is asking for the cube root of (-162). The cube root function is, what number times itself 3 times equals the number under the radical sign. The answer to this is, approximately -5.451 .

By adding the 1st and third equation together, you get rid of z and end with 7x+8y=13. The second equation will be the second equation and 2 times the first equation, so the will yield 3x+8y=1. Now, you solve this system of equations and get x3, y=-1, and z=-4