4 6 Find [/12 3: y dA, where R is the parallelogram 6:13 | y enclosed by the lines 4a:6y:0, 4:c6y:6, 6m+y=1, 623+y: Give the exact answer. This can be done directly with a tedious computation, or can be done with a change of variables to transform the parallelogram into a rectangle. Hint: Let u : 4m 63; and v : 6m | y