The sum of two numbers is 12, and their difference is 6. What are the two numbers?
What is (3,9)?
200
Solve the following system:
3y-2x=4
x=3-y
What is (1,2)
200
Solving the following system:
2x+6y=-12
3x-2y=4
What is (0,-2)?
200
Solving the following system:
x+y=-1
x-y=3
What is (1,-2)?
200
Twice a boy's age is 9 more than his brother's? The average of their ages is 12. How old are they?
What is (11,13)?
300
Solving the following system:
2x-y=-8
3x+2y=-5
What is (-3,2)
300
Solving the following system:
2x+y=2
3y=-6x+6
What is infinite many solutions?
300
Solving the following system:
y=-3x
x+y=2
What is (-1,3)?
300
A girl has $6 in 36 coins (all quarters and nickels). How many of each does she have?
What is 21 quarters, 15 nickels?
400
Solving the following system:
3x-6y=30
2y=x+6
What is no solution?
400
Solving the following system:
5x+2y=2
3x+5y=24
What is (-2,6)?
400
Solving the following system:
2x-4y=-4
3x-y=4
What is (2,2)?
400
My mom's cell phone costs $10 per month plus $0.10 per minute. My aunt's phone costs $3 per month plus $0.15 per minute. For what amount of talking time will the cost of these plans be the same?
What is 140 minutes?
500
Solving the following system:
2a+4b=-5
3a-5b=9
What is (0.5, 1.5)
500
Solving the following system:
0.7x+2y=1.61
2x-0.3y=0.39
What is (0.3, 0.7)?
500
Solving the following system:
25x-10y=0
2y=5x
What is infinite many solutions?
500
How many liters of a 60% salt mixture must be added to 2 liters of a 30% salt mixture to yield a 48% mixture?