Evaluate the double integral 
for the given function f(x, y) and the region R.
f(x, y) = 3x + 4y; R is bounded by x = 0, x = 1, y = 0 and y = x.
Definitions:
Inert Substance
A substance lacking active properties, particularly in the context of chemical reactions, not capable of inducing a change or reaction in other substances.
Pain Relief
Methods or treatments used to reduce or alleviate physical discomfort or pain.
Inert Substance
A material that does not undergo chemical reactions under set conditions, often used as a control in experiments.
Placebo
A substance with no therapeutic effect, used as a control in testing new drugs.
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