Solving Systems by Elimination
Presentation
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Mathematics
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9th - 12th Grade
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Practice Problem
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Medium
Dr. Kimbley-Nelson
Used 4+ times
FREE Resource
29 Slides • 6 Questions
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Fill in the Blanks
What are we looking for?
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Choose a variable to represent that quantity.
Let n = the first number.
Let m = the second number.
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The sum of two numbers is 39.
Their difference is 9.
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Fill in the Blanks
How would you write the first equation?
The sum of the two numbers is 39.
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Fill in the Blanks
How would you write the second equation?
Their difference is 9
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The system is:
n + m = 39
n - m = 9
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To solve the system of equations, use elimination.
The equations are in standard form and the coefficients of are opposites.
Add
n + m = 39
n - m = 9
_______________
2n = 48
Now solve for n
10
Fill in the Blanks
Solve
2n = 48
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n + m = 39
n - m = 9
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Multiple Choice
What does 'n' equal?
15
9
24
39
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Multiple Choice
What does 'm' equal?
24
9
15
39
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