Answer: c
This system has infinitely many solutions.
Explanation:
Solve by substitution:
1) Solve
for
:

2) Substitute
for
in
:


3) Simplify both sides of the equation:

Therefore, This system has infinitely many solutions.
Solve by elimination:
You can't solve this system of equations by elimination.
Solve by graphing:
The lines are directly on top of each other, Therefore there are infinitely many solutions.