If 4x + y = 8 and −2x + y = 13, then what is the value of 2x + 2y?  Choose the correct choice from the following answers:
A) 1/7  B) 3  C) 15  D) 21  E) 60/7
4x + y = 8   −2x + y = 13   Adding both the equations --&gt; 2x + 2y = 21   Answer: 21
<result>D</result>
If 4x + y = 8 and −2x + y = 13, then what is the value of 2x + 2y?