What is the rule? It will be easier to put this equation into a graphing calculator because it shows the table for this equation.
First, you have to round the .1, which would be .0. Next, you round 19.0, or just 19, to the nearest 10, which is 20. Therefore, 19.1 rounded to the nearest 10 is 20.
-31x+5 is the same as (-18x-12)-13x+17