Question

explain how the graph y=ab^x is different from graph y=b^x for a positive value a(a not equal to 1)

Answer 1

It tells you the y intercept. When x = 0 then b^x = 1 so it gives you y = a, the intercept.
For example:
http://www.wolframalpha.com/input/?i=plot+a+3^x+for+a+in+ {2%2C3%2C4%2C5%2C6%2C7%2C8}

Answer 2

Copy paste that into your browser.

Answer 3

thank U

Answer 4

still need to understand

Answer 5

?