Taylor's sister is 7 years less than twice Taylor's age,a. The sum of Taylor's age and her sister's age is 41. Which equation represents this relationship
1) a + (7 - 2a) = 41
2) a + (2a-7)=41
3) 2a-7=41
4) a = 2a - 7

Explain why the other 3 choices are incorrect.