Answer:
![\frac { 1 } { 2 }](https://img.qammunity.org/2020/formulas/mathematics/college/pbm0dud0tfog5av76fxdwehwrymoj0padg.png)
Explanation:
We are given the following expression and we are to evaluate it when the value of a is 10 and b is -9:
![\frac { 6 - b } { 3 a }](https://img.qammunity.org/2020/formulas/mathematics/middle-school/96gkkeltv3ukd50vuddvp17uwqr4i028q7.png)
Substituting the given values in the above expression to get:
![\frac { 6 - (-9) } { 3 * 10 }](https://img.qammunity.org/2020/formulas/mathematics/middle-school/kxeq1dvjpoqr3iy51jaewv1ywrlue2l18h.png)
![\frac { 1 5 } { 3 0 }](https://img.qammunity.org/2020/formulas/mathematics/middle-school/n9jz73tgdv53onqlehtkodpfu5uc9lk415.png)
![\frac { 1 } { 2 }](https://img.qammunity.org/2020/formulas/mathematics/college/pbm0dud0tfog5av76fxdwehwrymoj0padg.png)
Therefore, the simplified form of the given expression that we get after evaluating it when a is 10 and b is -9 is
.