Consider the following equations:
1) 2x - 3y + 2 = 7
2) + 4y – z = 2
3) 5x – 2y + 5z = V2
4) 2x + xy – 3z = 7
Which of the above equations are not linear equations in x, y and z.
A. (2) only.
B. (2) and (3) only.
C. (2) and (4) only.
D. (2), (3) and (4) only.
E. (1) only.