Line B has a constant of proportionality between x and y.
What is the equation of a line?
The general equation of a line is y = mx + c
where m is the slope of the line and c is the intercept.
A linear equation is defined as an equation in which the highest power of the variable is always one.
According to line A,
Increasing x by one unit causes y to rise by four units, or from (1,3)
According to line B,
If we increase x by one unit, y will also increase by one unit, or (1,1), and similarly, other points will become (2,2), (3,3), (4,4), etc.
According to line C,
Increasing x by 3 units causes y to increase by 1 unit, or (3,1),
In the above lines, the value of x is exactly equal to that of y in line B.
Hence, line B has a constant of proportionality between x and y.
Learn more about the lines here:
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