The expression 7^6 ; can be interpreted as 7 raised to the power of 6 ; which is (7 * 7 * 7 * 7 * 7 * 7). To execute this expression using a computer or basic mathematical operation on a computer we use the power symbol which the computer understand this the double multiplication symbol (**)
the easy formula is rise/run. If you find the two points where it perfectly intercepts the graph you could up 1 unit and right 5, or down 1 unit and left 5, both leaving you with 1/5