Question

Form the PDE by eliminating a and b from z=a(x+y)+b​

Answer 1

Z = a(x+y)+b

Z = ax + ay + b

to eliminate we need the whole sum as the definite value of 20

so

Z = ax + ay + b

let

ax + ay + b = Z

so Z = Z

there fore

Z + Z = 20

2Z = 20

z = 10