hi please answer in the next 30 minutes if you can, thank you!

Question 4 (0.5 points) A table of values of a linear function z=f(x,y) is given below: x\\y y=-1 y=1 y=3 x=0.54.25 0.25-3.75 x=1 4.5 0.5 -3.5 x=1.54.75 0.75-3.25 (a) Determine the linear function z=f(x,y). (b) Evaluate the function at (1,2), i.e., find f(1,2). Enter your answer in the blank below. Your