Sewanhaka High School
Math 8
Per:________________
Name:________________________________
H.W. #44: Ditto
DO-NOW #44:
1) Solve the following system of equations
algebraically:
2x + 3y = 12
x – 3y = 6
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:_____________________
2) Write the next three terms in the sequence.
3, 7, 11, 15,
3) What is the GCF of 18 and 42?
Topic: Expressions and Equations
Main Idea: Solving a system of equations algebraically using elimination
Aim:
RECALL
NOTES
Say if you could not solve a system of equations with
addition or substitution right away. For example, say
if I gave you the system of equations:
2x + 3y = 10
5x – 2y = 6
How would you go about solving that system of
equations?
Solve the system of equations algebraically:
2x + 5y = 16
4x – 2y = 8
Solve the system of equations algebraically:
3a + 4b = 20
a + 2b = 8
Solve the system of equations algebraically:
4x + 5y = 13
2x + 3y = 7
Math 8 – LP #44 – Page 2
Drill:
Determine which method to use, substitution, addition, or elimination to solve the following systems of equations
algebraically and make sure to check:
1)
2)
3)
4)
3x – 4y = 2
5x + 8y = 1
r + s = -6
3a – b = 3
x = 2(7 – y)
3x + 4y = -1
r – s = -10
a + 3b = 11
Summary: