Cho đường thẳng (d): y= ax+6 xác định hệ số a trong các trường hợp sau:

a. Có hệ số góc là 3

b. Đồ thị hàm số d // đường thẳng y=2x

c. (d) đi qua A(2;-2)

1/ there/ be/ steady/ increase/ demand/ hotel accommodation/ since1998

2/ these days/ more/ more/ people/ be/ suffer/ air pollution

3/ I/ never/ read/ such/ romantic story/ this/ before

4/ she/ spend/ most /time/ surf/ net / information / the next trip

5/ Van Gogh/ have/ major influence/ development/ modern painting

6/ the house/ that/ we/ ent/ London/ last year/ be/ fully/ furnish

7/ people/ face/ large/ amount/ environmental problems/ every day