图象经过（1，2）的正比例函数的表达式为____．

下列x的值能使$\sqrt{x-6}$有意义的是（　　）

    I'm Peter. There are four people in my family. They are my father, my mother, my grandfather and me. I'm twelve. My birthday is on 15th March. My parents are both doctors. They help people. Their birthdays are both in May. My grandfather is old. He is sixty-five. His birthday is on 9th June. He likes reading. I like reading too. I want to be a teacher in the future. I want to teach Chinese in a school.

已知命题$p:\forall x\in R,\sin x\le 1$，则                （     ）