## 3. A simple element analysis (cont'd)

The Cartesian-coördinate method involves choosing as basis functions the set $$\{1, x, y\}$$. The displacement at any point $$(x, y)$$ in the element is then given by a linear combination of these three functions, namely,
 $w\left(x,y\right)={c}_{1}+{c}_{2}x+{c}_{3}y$ (Eqn. 5)

R. Funnell