Question

Match the equations to the graphs:
http://img853.imageshack.us/img853/3016/unledwsk.png

Please explain! I have to know how

Answer 1

http://img853.imageshack.us/img853/3016/unledwsk.png
Use this link. It's clickable ^^

Answer 2

substitute x = 0 in all the equations and figure out which line corresponds to which

Answer 3

You can also get help by recalling the common graphs, such as e^x , lnx, and logx. You should know these. Then for 3^x and 4^x you shall do a quick mental calc:
3^0 = 1
3^1 = 3
3^2 = 9
and you can find out which it is,
the last one is the 4^x, do the same stuff ;)