Identifying Functions

1) 2

2) -5

3) 0

4) 2/7

5) undefined

6) -4/3

7) 12

Step-by-step explanation:

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1) = 2  

2) =- -5   as workings show -20/4 = -5/1 = -5

3) = undefined  we show equation x = 8

4) = 2/7  

5) = undefined we show equation as y=6

6) = undefined as workings show 12/3 = 4/3 positive

7) = 12   as workings show  24/2  = 12/1

We use the formula  y2-y1  / x2-x1

As we enter a value say - 4  up on y1

or - 4 up on x1

Then it becomes - - (two subtractions together) they become plus =  positive + and either one has a negative sign in front.

if used as second order in bold in formula.

Student 1’s methods would be more accurate, because the student would control more factors. Only one variable at a time (either temperature or acidity) would be tested on each group of worms. On the other hand, Student 2 is testing both factors on all the worms, which could make the results unclear.