Homework – Page 120 Book

Homework – Page 120 BookPeriod 1, 6, 7 Do # 25 – 33 all

Period 3 & 5 Do # 25 – 30 all

10/30 3.2 – Solving Systems Algebraically

10/30

Solve by SUBSTITUTION

2nd equation

1st equation

Your Turn

Solve by ELIMINATION

2nd equation

Substitute

Solve by ELIMINATION

Try this one …

Another Elimination Example

2x + 3y = 125x – 2y = 11

Classwork - Practice in your Notes

The following sides were from previous section

1) A service club is selling copies of their holiday cookbook to raise funds for a project. The printer’s set-up charge is $200, and each books costs $2 to print. The cookbooks will sell for $6 each. How many cookbooks must the members sell before they make a profit?a)Write two equations. b)Solve for y. (already done)c) Then graph.

y = 2x + 200y = 6x

(50, 300)

2) GEOMETRY – The sides of an angle are parts of two lines whose equations are 2y + 3x = -7 and 3y – 2x = 9. The angle’s vertex is the point where the two sides meet. Find the coordinates of the vertex of the angle.

Y = (-3/2)x – (7/2)Y = (2/3)x + 3

(-3, 1)

3) Adam and his family are planning to rent a midsize car for a one-day trip. In the Standard Rental Plan, they can rent a car for $52 per day plus 23 cents per mile. In the Deluxe Rental Plan, they can rent a car for $80 per day with unlimited mileage.

a) For each plan, write equation that represents the cost of renting a car.

b) Graph the equations. Estimate the break-even point of the rental costs.

c) If Adam’s family plans to drive 150 miles, which plan should they choose?

y = 52 + 0.23xy = 80

y = cost of renting a car ($$$)x = # of miles driven