Incorrect. Use this system to solve this problem:

Total amount of coffee: $\displaystyle{k}+{f{=}}{8}\usepackage{cmbright}\Huge\$

Total cost of coffee: $\displaystyle{8}{k}+{6}{f{=}}{51}\usepackage{cmbright}\Huge\$

Where k represents the amount of Kenya coffee and f represents the amount of French Roast coffee. Use substitution or elimination to solve for k and f.