Mary's sink was clogged, so she called a plumber. the plumber charges a service fee of $50 as well as $25 for each hour he worked. if mary paid $135.50, write an equation to find the number of hours, h, that the plumber worked.

Which of these statements is correct? the system of linear equations 6x - 5y = 8 and 12x - 10y = 16 has no solution. the system of linear equations 7x + 2y = 6 and 14x + 4y = 16 has an infinite number of solutions. the system of linear equations 8x - 3y = 10 and 16x - 6y = 22 has no solution. the system of linear equations 9x + 6y = 14 and 18x + 12y = 26 has an infinite number of solutions.