6x + 2y = 24....subtract 6x from both sides
2y = -6x + 24...now divide both sides by 2
y = -6/2x + 24/2...now reduce
y = -3x + 12 <=== slope intercept form of y = mx + b
Check the picture below.
a bisector, means, it "cuts in two equal halves".

Table 3 is showing a proportional relationship between x and y.
Reason:
The value of x in table 3 is its square of value of y,
x y


