### Home > CCA2 > Chapter 7 > Lesson 7.2.1 > Problem 7-121

7-121.

Find the equation of the exponential function of the form

*y*=*ab*that passes through each of the following pairs of points. Homework Help ✎^{x}(1, 18) and (4, 3888)

(–2, –8) and (3, –0.25)

Construct two equations by substituting the coordinates

for *x* and *y*.

18 = *ab*^{1}

3888 = *ab*^{4}

Use substitution to find the value of *a* and *b*.

*y* = 3(6)^{x}

Use the same method as part (a).