Solve the System Using the Addition Method $x$
- $0.9 x+0.2 y=4.2$

Multiple Choice

Solve the system using the addition method. If the system is inconsistent and has no solution, state this. If the system is dependent, write the form of the solution for any real number $x$ .
- $0.9 x+0.2 y=4.2$
$\mathrm{x}-0.1 \mathrm{y}=3.7$

A) $(0.4,0.3)$
B) $\varnothing$
C) $(3,4)$
D) $(4,3)$