3. A middle school yearbook committee has 35 members. There are 7 more girls than boys. Write a system of linear equations, define your variables, and solve the system to find the number of boys and number of girls.
well,suppose the number of boy is x,then the number of girl is y=x+7,then the number of girls and boys is 2x+7=35.so x is 14.it means the number of boy is 14,girl is 21.
