Is it pp PP pP or coc

What is the multiplicative rate of change of the exponential function shown on the graph?

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).

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers