Max is painting a fence. The table shows the number of square feet he painted after various numbers of minutes. What is the rate of change?

2 minutes - 1 minute = 1 minute

7 square feet - 3,5 square feet = 3,5 square feet

ANSWER:The rate of change is 3,5 square feet per minute.

Explanation:

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4