One positive number is 8 times another number. Their difference is 70. Which of the following equations could be used to find the numbers? x - 8x = 70 8x - x = 70 x - 8 = 70

A = first number (larger number)

b = second number (smaller number)

a = 8b

a - b = 70 *

* since a is the larger number and their difference is positive, we want a-b.

plug the first equation into the second to get:

a - b = 70

(8b) - b = 70

8b - b = 70

Your correct answer would be choice #2.