Multiple Choice Identify the
choice that best completes the statement or answers the question.


1.

If the system is to be solved by substitution, which
expression can be replaced for x in the second equation?
A.  15  2y  C.   B.  21 
5x  D.  


2.

Solve the system by substitution.
A.  (2, 7)  C.  (5, 1)  B.  (1, 1)  D.  none of these 


3.

Use substitution to solve the system of equations.


4.

Which is the solution of this system of equations?
A.  (7, 8)  B.  (7, 6)  C.  There is no solution.  D.  There is an infinite number of
solutions. 


5.

Use substitution to solve the system of equations.
