If the relationship is proportional, what is the missing value from the table?
Help please

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Which graph depicts the path of a projectile

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?