I’m doing solving systems for my math class and one of the topics includes solving linear inequality systems graphically and I don’t know how to do any of this. HELP ME PLEASE

Ineed to learn how to solve this problem

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.

Find dy/dx using implicit differentiation ln(20+e^xy)=y