This is your answer One pound of meat costs 3.50$. If the total is 244$, how many pounds of meat have you bought?
Given:
The table of values is
Number of Students : 7 14 21 28
Number of Textbooks : 35 70 105 140
To find:
The rate of change and showing that the ratios of the two quantities are proportional and equivalent to the unit rate.
Solution:
The ratio of number of textbooks to number of students are




All the ratios of the two quantities are proportional and equivalent to the unit rate.
Let y be the number of textbooks and x be the number of students, then

Here, k=5.


Hence the rate of change is constant that is 5.
12x^4+18x^2
= 3x^2 (4x^2+6)
Thus, the greatest common factor is 3x^2