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`x/0=y/0=(z-4)/1``x/1=y/2=(z-4)/-3``x/1=y/1=(z-4)/-7``x/1=y/2=(z-4)/-7`

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The plane is `x+3y+z-4+lambda(2x-y)=0` <br> This is always passes through the line of intersection of the planes `x+3y+z=4=0` and `2x-y=0` <br> Now, `2x-y=0 rArr x/1=y/2` <br> `therefore x+3y+z-4=0` <br> `rArr x+3.2x+z-4=0` <br> `rArr x+3.2x+z-4=0` <br> `rArr 7x+z-4=0` <br> `rArr 7x = -(z-4)` <br> `rArr x/1=(z-4)/-7` <br> `therefore` line is `x/1=y/2=(z-4)/-7`**meaning of function**

**Modulus; signum; greatest integer and fractional part function**

**representation of function**

**Physical interpretation**

**Domain codomain and range of function**

**Graph of function: Vertical line test**

**Identity function**

**Explain Constant function with graph**

**Modulus function and properties**

**Greatest integer function and properties**