### Home > AC > Chapter 13 > Lesson 13.OF1-S > Problem 7-127

7-127.

Substitute both points into the equation *y* = *ab ^{x}* and solve for

*a*and

*b*.

*y* = 40(1.5)^{x}

*x* = −9, or October 22

7-127.

Substitute both points into the equation *y* = *ab ^{x}* and solve for

*y* = 40(1.5)^{x}

*x* = −9, or October 22