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Home > PC > Chapter 4 > Lesson 4.2.4 > Problem 4-118


An exponential function passes through the points and . The function has a horizontal asymptote at . Find an equation for the function.

Write the general equation for this problem.

Substitute the points in for , creating two equations and two unknowns.

Subtract on both sides.
Then divide one equation by the other.

Substitute the -value back into one of the original equations and solve for . Then substitute and into the general equation.