### alg 1b 6.4 - Souderton Math

```Applications of Linear Systems
Objective: To choose the best
method for solving a system of linear
equations.
How do we solve?
How do we solve?
T  9  1.15h
S  7  .75h
Problem 1
Problem 1
Got it?
Got it?
C  864 .80x
I  2x
2 x  864 .80x
1.2 x  864
x  720
Problem 2
Problem 2
Got it?
Got it?
x  20% solution
y  12% solution
x  y  15
.20x  .12 y  .18(15)
Got it?
x  20% solution
y  12% solution
x  y  15
.20x  .12 y  .18(15)
x  15  y
.20x  .12 y  .18(15)
.20(15  y )  .12 y  2.7
3  .20 y  .12 y  2.7
 .08 y  .3
y  3.75, x  11.25
Air Travel
Problem 3
Problem 3
Got it?
• You row upstream at a rate of 2mi/h. You travel the
same distance downstream at a rate of 5 mi/h. What
would be your rowing speed in still water? What is
the speed of the current?
Got it?
• You row upstream at a rate of 2mi/h. You travel the
same distance downstream at a rate of 5 mi/h. What
would be your rowing speed in still water? What is
the speed of the current?
Row  current  speed
rw5
rw2
2r  7
r  3.5, c  1.5
Homework
• Pages 386-387
• 7-15 odd
```