BALTIMORE — Baltimore teachers voted to approve a new contract that links pay increases to student performance. Members of the Baltimore Teachers Union voted 1,902 to 1,045 on Wednesday to pass the contract, which originally fell 400 votes short of approval last month. BTU President Marietta English said teachers wanted more information and an opportunity to give feedback. English said the union held meetings at all city schools to explain the new contract and develop an agreement that reflected teacher’s input and concerns. Under the new contract, teachers will no longer receive automatic raises based on tenure and degrees, but will climb a four-step ladder with top-tier teachers earning six-figure salaries.