Question

Write the equations: The difference of two numbers is 3 and their sum is 13. What are the two numbers?
Let ___ = _____________
Let ___=______________

Answer 1

Let x = the first number
Let y = the second number

The equation for the difference of the two numbers is:
x - y = 3

The equation for the sum of the two numbers is:
x + y = 13

Answer 2

Write the equations: The difference of two numbers is -10 and the sum is -4.
Let ___ = _____________
Let ___=______________

Answer 3

Let x = the first number
Let y = the second number

The equation for the difference of the two numbers is:
x - y = -10

The equation for the sum of the two numbers is:
x + y = -4

Answer 4

Write the equations: Jack and his sister Malonie are 4 years apart in age. The sum of their ages is 28. What are their ages?
Let ___ = _____________
Let ___=______________

Answer 5

Let x = Jack's age
Let y = Malonie's age

The equation for the age difference is:
x - y = 4

The equation for the sum of their ages is:
x + y = 28

Answer 6

Write the equations: Two of Julie’s textbooks are a total of $65. The difference in price between the two books is $9. What is the cost of each book?
Let ___ = _____________
Let ___=______________

Answer 7

Let x = the cost of the first textbook
Let y = the cost of the second textbook

The equation for the total cost of the textbooks is:
x + y = 65

The equation for the difference in price between the two books is:
x - y = 9