Is this proportional? 3 for $22.50 5 for $37.50

Step-by-step explanation:

$22.5/3 = 7.5 each

37.50/5 =7.5 each

y = kx

y = 7.5 x

This relationship is proportional

there is no grid

step-by-step explanation:

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.