Question

For each table,determine whether it shows that x and y are proportional.If x and y are proportional,fill in the black with a number in simplest form.

Answer 1

To find if a set of (x,y) data is proportional find the difference between each y data. If the difference is the same it is proportional.

Table 1:

$\begin{gathered} 30-25=5 \\ 35-30=5 \end{gathered}$

It is proportional

y is 5 times x

Table 2:

$\begin{gathered} 21-5=16 \\ 45-21=24 \end{gathered}$

It is not proportional