Hi I need help on what is the answer to this problems? Below is the question and other concerns will be in the comment section. I hope you can help me and surely I will give you full positive feedback.

II. Modified True or False. On the space provide before each number, write TRUE if the statement is true; otherwise, change the italicized word/phrase or expression to make the statement correct. 1. If z = 3xly - 2xy, then dz = (6xy - 2y? )dy + (3x2 - 4xy)dx ANSWER: dz = (3x2 - 4xy)dy + (-2y' + 6xy)dx 2. Consider the functionf (x, y) = 3x2 - 2xy3. The partial derivative with respect to y is equal to. 2y dy. Answer: -2y3 + 6x 3. If xy + xz + yz = 0, then az x+z Y+Z ax zty ANSWER: X+Y 4. Suppose the demand equations for two related commodities are given by x = f(p, q) andy = g(p.q). where x and y are the quantities and p and q are the corresponding unit prices. The commodities are competitive if "= > 0 and Y