Variable Substitution
Presentation
•
Mathematics
•
8th Grade
•
Hard
Joseph Anderson
FREE Resource
4 Slides • 5 Questions
1
By Reed Carbone
2
Step 1: Solve one of your equations for a certain variable (either x or y it doesn't matter)
Step 2: Substitute the expression you find into your other equation.
Step 3: Combine like terms until you can solve for your remaining variable.
Step 4: Plug the value you find for your variable into your original equation to solve for the final variable.
3
25y = -5x
4
One day, 481 people used a swimming pool. The prices were $1.25 for children and $2.25 for adults. The receipts for admission totaled $865.25. How many children and how many adults swam at the pool that day?
5
Multiple Choice
6x - 2y = -6
11 = y - 5x
Infinitely Many Solutions
No Solutions
(-9,-4)
(-4,-9)
6
Multiple Choice
y = 3x - 10
3x + 2y = 16
Infinitely Many Solutions
No Solutions
(4,2)
(2,4)
7
Multiple Choice
x = 8y - 4
x + 8y = 6
Infinitely Many Solutions
No Solutions
(1,85)
(85,1)
8
Multiple Choice
Pedro has 276 more hits than Ricky. They have a total combined hits of 2,666. How many hits did each of them have?
Pedro 1,471
Ricky 1,195
Pedro 1,195
Ricky 1,471
Pedro 1,252
Ricky 1,414
Pedro 1,414
Ricky 1,252
9
Multiple Choice
Tickets to a play are $3 for students and $8 for adults. On opening night, $1,000 was collected and 150 tickets were sold. How many adults and students attended the play?
50 Adults
100 Students
100 Adults
50 Students
40 Adults
110 Students
110 Adults
40 Students
By Reed Carbone
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