Science:Math Exam Resources/Courses/MATH221/December 2007/Question 06 (b)/Statement

Find the coordinate vector of $\left(\begin{array}{c}7\\ 10\end{array}\right)$ in the basis ${ℬ}=\{\left(\begin{array}{c}1\\ 1\end{array}\right),\left(\begin{array}{c}1\\ -1\end{array}\right)\}$.