I just need help understanding linear equations and linear graphs with the equation: y=1/3x+3 Please explain the process

Three times the sum of a number and seven is negative thirty-six. what is the number?

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?

Which statement is true about the discontinuities of the function f(x) = x-5/ 3x^2-17x-28