Mandy cleaned six and a half boards for her fence. Chelsea helped many out and cleaned an additional five and two –thirds boards. How many fence boards did the two girls clean in all?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.