Think about \[y\text{ }=\text{ }mx\text{ }+\text{ }c\] as the line going through the point (- 1, 2)
\[2\text{ }=\text{ }m\text{ }\left( -1 \right)\text{ }+\text{ }c\]
So we get
By additional computation
\[2\text{ }=\text{ }-\text{ }m\text{ }+\text{ }c\]
\[c\text{ }=\text{ }m\text{ }+\text{ }2\]
Subbing the worth of c
\[y\text{ }=\text{ }mx\text{ }+\text{ }m\text{ }+\text{ }2\text{ }\ldots \text{ }\left( 1 \right)\]
So the given line is
\[x\text{ }+\text{ }y\text{ }=\text{ }4\text{ }\ldots \text{ }.\text{ }\left( 2 \right)\]
By tackling both the conditions we get
By cross augmentation
\[1\text{ }+\text{ }m2\text{ }=\text{ }m2\text{ }+\text{ }1\text{ }+\text{ }2m\]
So we get
\[2m\text{ }=\text{ }0\]
\[m\text{ }=\text{ }0\]
Henceforth, the incline of the necessary line should be zero for example the line should be corresponding to the x-axis