30. what is the solution to the system of equations? (1 point)
-7x-2y+z =-2
6x-y-z=-18
5x+4y=z=18
(7,-1,45)
(-1,7,5)
(-1,7,9)
(1,-7,-5)
will give

Option B) (-1,7,5) is correct.

The solution to the given system of equation is (-1,7,5)

Step-by-step explanation:

Given system of equations are

To find the solution of the given system of equations by using Elimination method:

Now adding equations (1) and (2)

_________________

________________

 (since "-" getting cancelled)

Now adding equations (1) and (3)

_________________

________________

Now adding equations (4) and (5)

_________________

________________

Therefore y=7

Substituting y=7 in equation (4)

Therefore x=-1

Now substituting the values x=-1 and y=7 in equation (1) we get

Therefore z=5

Therefore the solution to the given system of equation is (-1,7,5)

Therefore Option B) (-1,7,5) is correct.

answer: 10 meter

step-by-step explanation:

need details