EDGE Math 8

Write an equation that satisfies the given condition in each statement. Use the indicated letters to represent the unknown quantities. Choose your answer.

1.	The sum of 2 numbers is 45. Let x = first number and y = second number.

x + y = 45

x - y = 45

2 x + 2 y = 45

none of the choices

Answer: $x + y = 45$

2.	The difference of 2 numbers is 10. Let x = first number and y = second number.

2 x - y = 10

x - y = 10

x + y = - 10

none of the choices

Answer: $x - y = 10$

3.	Julia's age is 3 more than twice Kris's age. Let x = Julia's age and y = Kris's age.

x = 2 y + 3

y + 3 = 2 x

y = 2 x + 3

none of the choices

Answer: $x = 2 y + 3$

4.	Leslie's age 2 years ago is the same as Jayvee's age 3 years from now. Let x = present age of Leslie and y = present age of Jayvee.

x + 2 = y - 3

x - 2 = y - 3

x - 2 = y + 3

none of the choices

Answer: $x - 2 = y + 3$

5.	In a meeting of the Math Club members, twice the number of boys present exceeded the number of girls present by 8. Let x = number of boys and y = number of girls.

2 x + y = 8

2 x + 8 = y

2 x - y = 8

none of the choices

Answer: $2 x - y = 8$

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