What is the slope of the line?

You can find the constant of proportionality by finding the ratio of

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?