1.
Section11.4:
SolvingLinearSystems
byMultiplyingFirst
1

2.
Objective(s):
By following instructions, students will be able to:
1. solve a system of linear equations by using
multiplication and elimination.
2

3.
3

4.
explain1A
Solve the system of linear equations by elimination. Check the answers by graphing the
systems of equations.
4

5.
5

6.
explain1B
Solve the system of linear equations by elimination. Check the answers by graphing the
systems of equations.
6

7.
7

8.
Your-Turn#1
Solve the system of linear equations by elimination. Check your answers by graphing the
systems of equations.
a) b)
8

9.
9

10.
explain2A
10

11.
11

12.
explain2B
12
The Tran family is bringing 15 packages of cheese to a group picnic.
Cheese slices cost $2.50 per package. Cheese cubes cost $1.75
per package. The Tran family spent a total of $30 on cheese. The
system of equations
⎧ s + c = 15
⎨
⎩ 2.50s + 1.75c = 30
represents this situation, where s is the number of packages of
cheese slices and c is the number of packages of cheese cubes.
How many packages of each type of cheese did the Tran family
buy?

13.
13

14.
14
Your-Turn#2

15.
15
Your-Turn#2

16.
16
☼
☼
☼

17.
Revisit Objective(s):
Did we...
1. solve a system of linear equations by using
multiplication and elimination?
17