Multiplying Equations
Presentation
•
Mathematics
•
7th - 11th Grade
•
Hard
Joseph Anderson
FREE Resource
4 Slides • 12 Questions
1
By Scott Donnelly
2
Multiple Choice
What is the LCM of 4 and 6?
12
24
48
6
3
Fill in the Blanks
What is LCM of 4 and 10?
Type answer...
4
Multiple Choice
Which variable should you eliminate in the system below?
2x−5y=15
3x+5y=25
x
y
5
Open Ended
Why should we eliminate the y variable?
2x−5y=15
3x+5y=25
6
Steps
Line of the terms, x over x, y over y and number after equal sign.
Look for opposite coefficients or the same coefficient.
Use the LCM of one of the coefficients to create the same or opposite coefficients. We try to only multiply 1 equation if we can
Multiply each term in the equation to get the LCM for the first equation and second equation
Use SSS or DSA to eliminate.
Solve for the remaining variable.
Substitute back into original equation to solve for other variable.
Write the answer as an ordered pair.
7
Poll
Which variable do you want to eliminate?
x
y
8
Solve System
9
Poll
Which variable do you want to eliminate?
x
y
10
11
Poll
Which variable do you want to eliminate?
3x+5y=12
−2x+3y=−8
x
y
12
Draw
What is the LCM of the variable you want to eliminate
3x+5y=12
−2x+3y=−8
13
Draw
Multiply the first equation to get the same coefficients.
3x+5y=12
−2x+3y=−8
14
Draw
Multiply the second equation to get the same coefficients.
3x+5y=12
−2x+3y=−8
15
Draw
Use DSA or SSS to solve for a variable.
3x+5y=12
−2x+3y=−8
16
Draw
Solve for the other variable
3x+5y=12
−2x+3y=−8
By Scott Donnelly
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