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1. Coefficients of a vector in a basis ●●○○○ 20 ptsGiven vectors $\vec{a} = (1, -1)$, $\vec{b} = (2, 1)$ and $\vec{c} = (-2, 1)$, suppose $\vec{c} = x\vec{a} + y\vec{b}$ with $x, y \in \mathbb{R}$. Find $x - y$.