Problem 6: Write a function piecewise2d.m to compute the following 2-dimensional function f(x.y): 5x + 5y for x 0 y>0 Set f to be zero for other conditions of x and y. Function piecewise2d.m should have the function declaration: function f - piecewise2d(x,y) where x and y are number inputs and f is a number output. Remember to include a description for the function. Use if elseif statements. (a) Set p6a-evalc('help piecewise2d') (b) Set p6b-piecewise2d (1, 1) (c) Set p6c-piecewise2d(1, -1) (d) Set p6d-piecewise2d(-1, 1) (e) Set p6e-piecewise2d(-1, -1) (f) Set p6f-piecewise2d(0, 0) (g) Set p6g-piecewise2d(0, 1) (h) Set p6h-piecewise2d(0, -1) (i) Set =piecewise2d(1, 0) (j) Set p6j-piecewise2d(-1, 0)