The equation $x=7$ in two variables, can be written as _____

Mayank and Sujata, two students of class $9^{th}$ together contributed $₹1000$ to PPM relief fund?

(i) Find the linear equation satisfying the data.

(ii) If Sujata contributed $₹475$, then how much (₹) much Mayank contributed?

A linear equation in two variables has $\underline{\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{P}\mathbf{ }\mathbf{ }\mathbf{ }}$solutions(s).

The graph of $\underline{\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{Q}\mathbf{ }\mathbf{ }\mathbf{ }}$line has an equation of the form $x=k$.

A line parallel to the $x-$axis cuts the $y-$axis at $\underline{\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{R}\mathbf{ }\mathbf{ }\mathbf{ }}$ point(s).

Distance between the graph of equation $y=2$ and $y=-4$ is $\underline{\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{S}\mathbf{ }\mathbf{ }\mathbf{ }}$units.

Then $\mathbf{P}\mathbf{,}\mathbf{ }\mathbf{Q}\mathbf{,}\mathbf{ }\mathbf{R}$ and $\mathbf{S}$ are