this is a sped class. how or how is easiest to teach them?

Answer 1

X is the number you put into the machine
The machine messes around with that number
Y pops out as your new number

For example:

y=2x

You put some number x into the machine.
The machine doubles that number.
The new numbers that pops out of the machine is y, which is just twice of whatever x was.

Answer 2

If you want to teach the f(x) notation rather than y:

f(x)=2x

The function f(x) (the output of the machine) when you put x in as the input, is twice of whatever x was. The value of the output depends on what the input was. In this case, the bigger the x (input) is, the bigger the f(x) (output) is.

Answer 3

input is 0,1,2,3 output is 5,5.5,6,6.5

Answer 4

y=.5x