Two quantities are proportional if all ratios that relate the quantities are equal.
Yes, see solution.
Practice makes perfect
Recall that two quantities are proportional if all ratios that relate the quantities are equal. Keeping this in mind, let's take a look at the given table.
Dozen
Cost ($)
Cost ($)/Dozen
6
21
21/6=3.5/1
8
28
28/8=3.5/1
10
35
35/10=3.5/1
14
49
49/14=3.5/1
Because the ratios are the same between each pair of quantities, we know that the relationship is proportional.
