Answer :
[tex]2x+y=20 \ \ \ |\times 2 \\
4x-2y=40 \\ \\
4x+2y=40 \\
\underline{4x-2y=40} \\
4x+4x=40+40 \\
8x=80 \ \ \ |\div 8 \\
x=10 \\ \\
2x+y=20 \\
2 \times 10+y=20 \\
20+y=20 \ \ \ |-20 \\
y=0 \\ \\
\boxed{(x,y)=(10,0)} \Leftarrow \hbox{answer A}[/tex]
Which of the following ordered pairs represents the solution to the system given below?
2x + y = 20 4x − 2y = 40