Question
Alex bought 9 tickets for $30. Adult tickets cost $4 and children's cost $2. How many children's tickets did he purchase?
Answers
bobpursley
A*4+C*2=30
A+C=9
double the second equation
2A+2C=18, now subtract from eq 1
4A-2A=12
A=6
C=3
A+C=9
double the second equation
2A+2C=18, now subtract from eq 1
4A-2A=12
A=6
C=3
Ms. Sue
Let a = adult tickets
c = children's tickets
a + c = 9
4a + 2c = 30
a = 9 - c
4(9 - c) + 2c = 30
36 - 4c + 2c = -6
-2c = -6
c = 3
c = children's tickets
a + c = 9
4a + 2c = 30
a = 9 - c
4(9 - c) + 2c = 30
36 - 4c + 2c = -6
-2c = -6
c = 3