Question

Separate the constants and variables from the following:
$12+z,15,\frac{-x}{5},\frac{-3}{7},\sqrt{x},\sqrt{3},\left(\frac{2}{3}\right)xy,\frac{\left(5xy\right)}{2},7,7-x,6x+4y,-7z,\frac{\left(8yz\right)}{3x},y+4,\frac{y}{4}$ and $\frac{\left(2x\right)}{\left(8yz\right)}$.

Answer 1

The symbols having a fixed numerical value is called a constant.
So, $15,\frac{-3}{7}$ , $7,\sqrt{3}$ are Constants
The symbol which may be assigned different numerical values is called a variable and their value can vary according to the given condition.
Variables = $12+z$, $\frac{-x}{5}$, $\sqrt{x}$, $\frac{2}{3}xy$ ,$\frac{\left(5xy\right)}{2}$, $7-x,6x+4y,-7z$, $\frac{\left(8yz\right)}{\left(3x\right)}$, $y+4,\frac{y}{4}$, $\frac{\left(2x\right)}{\left(8yz\right)}$