7 : 15=63:
Find the missing term in each pair of equivalent ratios

Step-by-step explanation:

7/15=63/x

7x/15=63

7x=15(63)

7x=945

x=135

So the missing term is 135.

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.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0