Answer:

Step-by-step explanation:
-x/56x = 2
-1/56 = 2
x = -1/56
21X_15 :-) :-) :-)!!!!! There you go!
Answer:
thats long just use calcukator
Answer:
4 parameters are necessary to specify all solutions and correspond to the number of free variables of the system.
Step-by-step explanation:
Remember that the number of free variables of a system is equal to m-rank(A) where m is the number of unknowns variables and A is the matrix of the system.
Since the system is consistent and the rank of the matrix is 3 then echelon form of the augmented matrix has two rows of zeros.
Then m-rank(A)=7-3=4.