The equations below are linear equations of a system where
a
a,
b
b, and
c
c are positive integers.
a
y
+
b
x
=
c
ay+bx=c
a
y
−
b
x
=
c
ay−bx=c
Which of the following describes the graph of at least 1 such system of equations in the standard (x,y) coordinate plane?
I. 2 parallel lines
II. 2 intersecting lines
III. A single line