4.3 Algebra 2

Brett Solberg AHS 2011-20124.3 Algebra 21Warm-upFind the solution of the equations by graphing, substitution, and linear combination.

2x + y = 60x + 2y = 75

(make your graph in intervals of 10)

2Test Recap2nd Average 30/40 = 75%High 424th Average 28/40 = 70%High 43

Make-up OptionsCorrect on separate paperStaple to testTurned in this week

Missing ReviewPTC Extra Credit3Todays ObjectivesFinding solutions of systems of equations in real-life situations.

GraphingSubstitutionLinear Combination4

5

Night at the movies.George bought two movie tickets and a large popcorn for $20. The next day he went and bought 3 movie tickets and 2 large popcorns for $32.50. How much was an individual movie ticket and popcorn?

Problem Solving Guidelines1) Understand the problemWhat is the problem asking?What do we know?2) Develop and carry out a plan.Write out equations.3) Find the answer and check. Solve

6Amount%Amount of %1st Solutionx 5%.05x2nd Solutiony 15%.15yMixture100 L12%100*.12 = 12x + y = 100 .05x + .15y = 12 Weedkiller

MilkAmount%Amount of %Heavy CreamLow-Fat MilkRegular Milk

Distance = Rate * TimeYou are traveling 60 mph. How far have you driven in one hour? Two hours? 10 hours?D = 60 * 1 = 60 milesD = 60 * 2 = 120 milesD = 60 * 10 = 600 miles

Train ProblemsDistanceRateTimeFreight Traind35 km/ht + 1Passenger Train d40 km/htd = 35(t + 1)d = 40t

PhoenixTrainStation35 km/ht + 240 km/htInvestmentsAmount%Yield1st Amountx9%.09x2nd Amounty10%.10yTotal Amount$15,000$1432x + y = $15,000.09x + .10 y = $1432

Homework4.3 pg. 171 #3-30, multiples of 3