Question

Ifu = 3.x + 2y, v = 4.1 – 5y then the value of (ou/ər),- (/Əy),​

Answer 1

Here you have a function f(x,y,z) such as

$\huge\mathcal\blue{F(x,y,z)=3x−2y+4z }$

A function has one and only one value for every point with coordinates (x,y,z).

Your question is fairly simple. You only have to plug in (as in replace) the required values in x,y,z correspondingly.

$\huge\mathcal\red{f(1,2,5)=3(1)−2(2)+4(5)}$

$\huge\mathcal\green{f(1,2,5)=3−4+20=19}$

Best of luck