Question 15226
y= 4x+3

input/output table is just a table that shows values for certain x's. x is the independent variable, and y is the dependent variable, because what we plug in for x yeilds the y. Domain is the numbers that we can plug into x, and the range is the values we can get out of y. The table looks something like this

x | y
-----
0 | 3
1 | 7
2 | 11
3 | 15

so you can see, I'm just plugging in values for x and getting the y. if you let f(x)=y then you can see
f(x) = 4x+3
x | y
-----
0 | f(0)=3
1 | f(1)=7
2 | f(2)=11
3 | f(3)=15