Please Show how to work out each question. Thank you.

Solve each system of equations using any method (substitution, elimination, or matrices).

#1 - 11 (.5 pt each) 1. 5x - 12y = 207 5x - 11y = 206 2. 4x + 15y = 344 x - 13y = -316 3. -11x = 395 + y 14y = -634 - 10x 4. -4x - 6y + 4z = 4 4x + y + z = -9 6x + 4y + 6z = 10 5. -2x + 4y + 2z = 18 x - 5y - 4z = -9 x + 2y - 2z = 11

\f\f#12 - 14 Find the product. If the product is not defined, state the reason. (7 pt each) To write matrices in plain text, use the square brackets [ ] located on the right hand side of a standard keyboard. Place a bracket around each line of the matrix, with an extra bracket at the beginning and the end. Commas may be used for clarity. Example: (1244, -74) [422, 7)) 12. a4 [ 20 -10 -16 ]| . 13 19 13. 8 10 -17 -4 20 4 =0: =25 A1 -5 5 -15 16 9 15 -17 =7 -1 \f