Question

Write a linear equation such that the point (1, 2) lies on its graph?​

Answer 1

Draw a line segment X and Y coordinate

Answer 2

The easiest way to answer this question is add the x coordinate and y coordinate.
Here x = 1 y= 2

x + y = 1+2

x+y = 3

Likewise,

x-y = 1-2

x-y = -1

Or

y =2x