Without Graphing, Decide:
(A) Are the Graphs of the Equations $\left\{ \begin{array} { l } x + y = 7 \\x + y = 2\end{array} \right.$

Multiple Choice

Without graphing, decide:
(a) Are the graphs of the equations are identical lines, parallel lines, or lines intersecting at a single point?
(b) How many solutions does the system have?
- $\left\{ \begin{array} { l } x + y = 7 \\x + y = 2\end{array} \right.$

A) lines intersecting at a single point; one solution
B) identical lines; infinite number of solutions
C) parallel lines; no solution