Homework – Page 120 Book Period 1, 6, 7 Do # 25 – 33 all Period 3 & 5 Do # 25 – 30 all.
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Transcript of Homework – Page 120 Book Period 1, 6, 7 Do # 25 – 33 all Period 3 & 5 Do # 25 – 30 all.
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
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