What is the solution of the system of linear equations?
-3x + 4y = -18
2x - y = 77

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Pls brainliest will be awarded if answer is correct

With number 11 ( show how you got the answer)