You are building a right-angled triangular flower garden along a stream as shown in the figure.

the fencing of the left border costs $8 per foot, while the fencing of the lower border costs $2 per foot. (no fencing is required along the river.) you want to spend $320 and enclose as much area as possible. what are the dimensions of your garden, and what area does it enclose? [the area of a right-triangle is given by
a = xy/2.]
left border ft=

bottom border ft=

garden area ft^2