1. • In the next part of this section, you will
have to decide which method would be
best to solve the linear system.
• Graphing
• Substitution
• Linear Combinations (elimination)

2. • Graphing = a useful method for
approximating a solution, checking the
reasonableness of a solution, and
providing a visual model.
• Section 7-1

3. • Substitution = a useful method when one
of the variables has a coefficient of 1 or -1.
• Section 7-2

4. • Linear Combinations = a useful method
when none of the variables has a
coefficient of 1 or -1, but opposite
coefficients.
• Section 7-3

5. Which of the three? Why?
• x + y = 300 x + 3y = 18
• 3x + 5y = 25 2x – 6y = 12
• y = 3x – 6 y = 2x + 5

6. • A toy maker produces wooden trains and
wooden airplanes. Each train requires 3
ounces of paint and each airplane requires
5 ounces of paint. The toy maker has a
gallon of paint (64 ounces). If he want to
use it to paint 14 toys, how many of each
can he paint?
• 3 trains and 11 airplanes

7. • A health food store mixes granola that
costs them $4 per pound and raisins that
cost them $2 per pound together to make
25 pounds of raisin granola. How many
pounds of raisins should they include if
they want the mixture to cost them a total
of $80?
• 10 pounds

8. Do P. 455 21- 26 any method
- you choose – show work!!!
BUT – use at least two different methods
(Note: 22-23 fractions in the ordered pair)
33, 37, 40