The sum of two numbers is 12. The first number, x, is twice the second number, y. Which system of equations could be

used to find the two numbers?

{ x + y = 12

1 x = 2 + y

s x + y = 12

1 X = 2y

o {xy = 12

= 2 + y

O

xy = 12

By 7:00PM, 1/3 of the junior class had arrived at a school dance. By 8:00PM, 30 more juniors had arrived, raising the attendance to 1/2 of the junior class. How many people are in the junior class? a. 30 b. 90 c. 120 d. 180 e. 140

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