5mn is the simplified answer
The values of x, y, and z are 1, 2, and 3 respectively after using the substitution method.
<h3>What is a linear equation?</h3>
It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
We have a linear equation in three variable:
2x + 3y - z = 5 ...(1)
4x - y - z = -1 ...(2)
x + 4y + z = 12 ...(3)
(from the equation 1 and 2)
After solving:

From the above, two equations:
y =2
z =3
Plug the above values in equation 1
x = 1
Thus, the values of x, y, and z are 1, 2, and 3 respectively after using the substitution method.
Learn more about the linear equation here:
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M α W
M = c1 * W
W α T
W = c2 * T
M = c3 * T
I think your question is missing ?
Answer:
-5/2
Step-by-step explanation:
The next term will be,
→ -2/4
→ (-2-3)/(4÷2)
→ -5/2
Hence, the solution is -5/2.