
Anamta J. answered 06/15/19
Certified 6-12 Math Teacher and Middle School Math Interventionist
Suppose that there are two types of tickets to a show: advance and same-day.
Lets say number of advance tickets ,x
number of same-day tickets,y
Advance tickets cost $40
total cost of advance tickets $40x
same-day tickets cost $35
total cost of same-day tickets $35y
For one performance, there were 70 tickets sold in all
x+y=70 (equation#1)
and the total amount paid for them was $2600
40x+35y=2600 (equations#2)
How many tickets of each type were sold?
Solve equation#1 and equation#2 simultaneously by substitution or elimination method
Substitution method is easiest for these equations.
So , if x+y=70
y=70-x plug this in equation#2
40x+35y=2600
40x+35(70-x)=2600
Solve for x
40x+2450-35x=2600
40x-35x=2600-2450
5x=150
x=30
plug this value in equation#1 or equation#2 and solve for y(equation#1 is the easiest to solve )
x+y=70
30+y=70
y=70-30
y=40
Therefore,40 same-day tickets were sold and 30 advanced tickets were sold.