2x - y + 3z = -6
-x + 2y - 3z = 12
y + 5z = -6

Solving the system of equations we get:

x=2, y=4, z=-2

Step-by-step explanation:

We need to solve the system of equations

Let:

First we find value of y from equation 3

Put value of y in equation 1

Now, put value of y in equation 2

Multiply equation 5 with 2 and add both equations 4 and 5

So, we get z=-2

Now put value of z in equation 3

So, we get y=4

Now, put value of y=4, and z=-2 in equation 1

So, solving the system of equations we get:

x=2, y=4, z=-2

answer: x= -2y

step-by-step explanation:

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.