There are 13 animals in the barn. Some are chickens and some are pigs. There are 40 legs in all. How
many of each animal are there?
What is 6 chickens and 7 pigs?
100
By graphing, the solution to the system
y = x
y = -x
What is (0,0) ?
100
The solution to the system
x + y = 2
y = 3
What is (-1,3) ?
100
The solution to the system
x + 5y = 12
-x +y = 0
What is (2,2) ?
100
4x - y = 12 & x + 6y = 13
Elimination
200
Find the value of two numbers if their sum is 12 and their difference is 4.
What is (8,4) ?
200
By graphing, the solution to the system
y = 3x - 4
y = -3x + 2
What is (1,-1)?
200
2y - x = 4
10y - x = 20
What is (4,2) ?
200
The solution to the system
-4x - 2y = -12
4x + 8y = -24
What is (6,-6)?
200
y = -20x + 1 & 20x + y = 6
Substitution
300
John went to Yellow Stone National Park one day this summer. All of the people at the park were either hiking or bike riding. There were 178 more hikers than bike riders. If there were a total of 676 people at the park, how many were hiking and how many were riding their bikes?
What is 427 hikers and 249 bikers ?
300
By graphing, the solution to the system
y = (1/3)x + 2
y = -x - 2
What is (-3,1) ?
300
The solution to the system
y = 6x - 11
-2x - 3y = -7
What is (2,1) ?
300
The solution to the system
5x + y = 9
10x - 7y = -18
What is (1,4)?
300
6x - 3y = -15 & 2x + y = -3
Elimination
400
Harold had a summer lemonade stand where he sold small cups of lemonade for $1.25 and large
cups for $2.50. If Harold sold a total of 155 cups of lemonade and collected a total of $265, how
many cups of each type did he sell?
What is 98 small cups and 57 large cups of lemonade?
400
By graphing, the solution to the system
y = -(3/2)x - 4
y = (1/2)x + 4
What is (-4,2) ?
400
The solution to the system
-3x + 3y = 4
-x + y = 3
What is no solution?
400
The solution to the system
-4x + 9y = 9
x = 3y - 6
What is (9,5)?
400
y = (4/3)x + 3 & (2/3)x + y = -3
Substitution
500
Phil bought 6 new compact disks and 2 used compact disks for $127.92. At the same prices,
Mackenzie bought 3 new compact disks and 8 used compact disks for $133.89. Find the cost of
buying a single used compact disk.
What is $9.99 ?
500
By graphing, the solution to the system
y = (5/4)x - 2
y = (5/4)x -1
What is no solution?
500
The solution to the system
-5x - 8y = 17
2x - 7y = -17
What is (-5,1) ?
500
The solution to the system
2x + 8y = 6
-5x - 20y = -15