Is (8,-8) a solution to 8x+y=64

Fast phone couldn’t copy and paste so i decided to right it down

Benito is selecting samples of five values from the table, which row will result in the greatest mean? population data row 1 4 2 2 3 3 row 2 3 3 4 3 2 row 3 2 4 3 4 3 row 4 3 4 4 7 3 row 1 row 2 r

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers