Which of the following exponential function me goes through the points (1,20) and (2,80)

Step-by-step explanation:

Let be the equation of the exponential function.

This exponential function goes through (1,20).

We put x=1 and y=20 into the above equation to get:

.....eqn (`1)

 This exponential function again goes through (2,80).

We put x=2 and y=80 into the above equation to get:

.....eqn (`2)

Divide equation (2) by equation (1)

Put b=4 in equation 1.

The required exponential function is or  

to rewrite a literal equation you may need to divide by a number, or by a variable.

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