4.1-1 For each of the following functions, determine the constant c so that f(x, y) satisfie the conditions of being a joint pmf for two discrete random variables X and Y: a. f(x, y) = c(x + 2y), x = 1, 2, y = 1, 2, 3. b. f(x, y) = c(x + y), x = 1, 2, 3, y = 1,...,x.

I'm having trouble understanding how to do this problem, could you please help

how did you get the new equations in last part of step 2?

Can i share my screen and show you a homework problem that I thought I did right but is wrong and I don't know what I've done wrong?

please solve this with clear text, as the last solution was not clear, also with full detail as well

You are designing a poster which has a border around the printed portion. The border is 2 inches wide on the left and right sides, and 3 inches wide on the top and bottom. The entire poster will be a total of 300 square inches, including the borders and printed portion combined.

I'm confused on how to do the second part of the problem still.

*look carefully to tell the difference between the two problems.