hàm số y = ax + b là hàm số bậc nhất khi nào ?????

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1, My aunt, Thuy, (live) ……………… in Ha Dong. She (work) ……………… in a hospital in the center of Hanoi, Every morning, she (catch) ……………… a bus to her hospital. Her work is (take) ……………… care of sick children. She (love) ……………… the children very much. She always (say) ……………… that children (be) ……………… very lovely. Now she (do) ……………… her job with great pleasure. She (not want) ……………… to change it. She (stay) ……………… with the children until she retires. 2, Lan (go) ……………… to school every day with her friends. 3, They (have) ……………… a party tonight. 4, The students (visit) ……………… their old teachers next week? 5, She (not have) ……………… bread for her breakfast. 6, I need (call) ……………… my parents today and (tell) ……………… them about my new apartment. 7, They can’t call me because they (not know) ……………… my new telephone number. 8, It (rain) ……………… As soon as the rain (stop) ……………… I will walk downtown. 9, What your sister (do) ……………… now? She (cook) ……………… dinner in the kitchen. 10, We (not go) ……………… camping next week. We (visit) ……………… the museum. 11, Miss Van is a journalist. She (not write) …………………..…… for Lao Dong Newspaper. She (write) ……………… for Nhan Dan Newspaper. 12, I would like (join) ……………..………… your club.