Question 14Five unit squares are arranged in the coordinate plane as shown, with the lower left corner at the origin. The slanted line, extending from $(a, 0)$ to $(3, 3),$ divides the entire region into two regions of equal area. What is $a?$ $\dfrac{1}{2}$$\dfrac{3}{5}$$\dfrac{2}{3}$$\dfrac{3}{4}$$\dfrac{4}{5}$
