Choose the best method for solving each system.
1.) x+3y=7
5x+11y=3

A. Graphing
B. Substitution
C. Elimination

2.) 5x-3y=3
2x+7y=6

A. Graphing
B. Substitution
C. Elimination

3.) Sally is comparing the costs of two dressmakers for her bridesmaids’ dresses. Given the differing costs per dress and consultation fee for two different seamstresses, compare the two choices and decide which seamstress would be the better choice according to how she increases or decreases her wedding party.

A. Graphing
B. Substitution
C. Elimination

Please help ASAP. Explanation would be greatly appreciated!