Question

解答两道高中数学问题啊（英文版）要有详细过程 回答的好加分

Exercise 1.Consider the following system of linear equations where a is a number:

2x + 3y - z = a
-4x - 6y = a
-x- z = a
注：这仨是个方程组 大括号打不进来
a) For what values of a does the system above have a unique solution?
b) For what values of a the system above does not have a solution?
c) What is the solution to the system above if a = 0?
d) What is the solution to the system above if a = 3/2?

Exercise 2 a) Solve the following maximization problem x; y  0:

maxx,y u(x, y) =1/3lnx +2/3lny
s.t. 3x + 2y = 24

注：方程组

b) Solve the following maximization problem for x; y  0:

maxx，y u(x， y) = min｛2x -y; 5x - 2y｝
s.t. x + y = 5
注：方程组

where min｛a，b｝ is the minimum number between a and b. Thus, for instance: min｛5， 4｝ =4, min｛-2，-7｝ = -7, min｛2x， 4x｝ = 2x if x 大于等于0 and min｛2x， 4x｝ = 4x if x 小于等于 0, etc.
不好意思 第一题 最后一个方程 弄错了 应该是 -x-z= a2 a的平方！

Answer 1

我英语看这个有点蛋疼

Answer 2

你告诉我maxx,y u(x, y)什么意思我绝对可以帮你解出来