The correct option is (a).
The given equations are of the following form:
a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0
Here, a1 = 2, b1 = −5, c1 = 4 and a2 = 2, b2 = 1 and c2 = −8
These graph lines will intersect at a unique point.
Hence, the given system has a unique solution.