Which of the following is a valid reason for using a given solution method to solve the system of equations shown
4x-5y=4
2x+3y=2

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps