ࡱ> vxu /bjbj ËËr&VV4id*8+++ccccccc$fEiVc-+*l+++c #d666+:c6+c66t]DjJDa0a+/,^&c9d0id^fi,,iLDaiDax++6+++++cc1+++id++++i+++++++++V v: Math 3 Honors: Unit 6 Name: __________________________________ SYSTEMS OF EQUATIONS A system of equations is two (or more) equations with the same variables. Example:  EMBED Equation.3  The SOLUTION to a system of equations is the ordered pair(s) that satisfies (solves) ALL of the equations. Which of the following ordered pairs is a solution to the example system? a. (-2, -11) b. (2, 1) c. (1, -2) There are THREE TYPES OF SOLUTIONS to any system of equations: 1) ONE SOLUTION: Exactly one ordered pair (x, y) will solve all equations. 2) NO SOLUTION: NO ordered pair (x, y) will EVER solve all equations. 3) INFINITELY MANY SOLUTIONS: an infinite number of ordered pairs will solve all equations. There are THREE SOLVING METHODS for system of equations: GRAPHING SUBSTITUTION ELIMINATION Method #1: GRAPHING: Find the intersection of lines STEP 1: Make sure each equation is in slope-intercept form ( y = mx + b) STEP 2: [Y =], for Y1 write your first equation, for Y2 write your second equation STEP 3: Adjust [WINDOW] is large enough with XMAX or YMAX to see both lines. STEP 4: [2ND] ( [CALC (Trace)] ( [5:Intersect] ( Scroll to intersection STEP 5: [ENTER] Three Times STEP 6: Solution Ordered Pair is Intersection: X = #, Y = # EXAMPLE - Step-by-Step: Solve by graphing:  EMBED Equation.3  Solve for y: Equation #1:  EMBED Equation.3  Equation #2:  EMBED Equation.3  GRAPH Find INTERSECTION (use calculator steps) ( SOLUTION: (-3.08, -5.23) More Key Terms about Solutions of Systems of Linear Equations: CONSISTENT: The graphs of each equation intersect or coincide. There is at least one ordered pair that satisfies both equations. INDEPENDENT System: the system has exactly one solution. The two lines intersect at ONE POINT DEPENDENT System: the system has an infinite number of solutions. The two lines are the SAME. INCONSISTENT: The graphs of each equation are parallel. There are NO ordered pairs that satisfy both equations. SUMMARY TABLE: Intersecting LinesSame LineParallel LinesGraph of a System SHAPE \* MERGEFORMAT  SHAPE \* MERGEFORMAT  SHAPE \* MERGEFORMAT Number of SolutionsExactly One SolutionInfinitely Many SolutionsNo SolutionsTerminologyConsistent and IndependentConsistent and DependentInconsistentGRAPHING - Examples: Make sure you have the equations in slope intercept - form!!! (1)  EMBED Equation.3  (2)  EMBED Equation.3  (3)  EMBED Equation.3  (4)  EMBED Equation.3  (5)  EMBED Equation.3  (6)  EMBED Equation.3  Special Case VERTICAL LINE:  EMBED Equation.3  Vertical lines cannot be graphed in calculator because equation is x = number. SUBSTITUTE x-value of vertical line into other equation to solve Method #2: SUBSTITUTION - substitute one equation into the other 3y = 2x + 11 y + x = 7-5x = 3y 4 y + 2x = 6STEP 1: SOLVE one of the equations for the given variable (y = or x = )Solve y + x = 7 for x. x = 7 ySolve y + 2x = 6 for y. y = 6 2xSTEP 2: SUBSTITUTE with parentheses the expression for x or y (STEP 1) into the other equation3y = x + 13 Substitute: (7 y) for x 3y =2 (7 - y) + 11-5x = 3y 6 Substitute (6 2x) for y -5x = 3(6 2x) 6STEP 3: SOLVE the equation created in STEP 2Solve 3y = 2(7 - y) + 11 for y, 3y = 14 2y + 11 3y = -2y + 25 5y = 25 y = 5Solve -5x = 3(6 2x) 6 for x -5x = 18 6x 6 -5x = 12 6x x = 12 STEP 4: Use SOLUTION to STEP 3 and find the value of the remaining variable in one of the original equations.Substitute y = 5 into y + x = 7 5 + x = 7 x = 7 -5 x = 2Substitute x = 12 into y + 2x = 6 y + 2(12) = 6 y + 24 = 6 y = -18STEP 5:Write the solution to the system as an ORDERED PAIR (x, y)Solution: (2, 5)Solution: (12, -18)EXAMPLE Step-by-Step: Solve  EMBED Equation.3 by substitution method. Solve for y in second equation  EMBED Equation.3  Substitute second equation into first for the variable y  EMBED Equation.3  Solve first equation  EMBED Equation.3  Substitute solution into second equation  EMBED Equation.3  Solution  EMBED Equation.3  H" (-3.08, -5.23) & matches GRAPHING METHOD: (-3.08, -5.23) PRACTICE SOLVE BY SUBSTITUTION: Hint: It doesn t matter which variable to use for substitution. There can be an easier one. (1)  EMBED Equation.3  (2)  EMBED Equation.3  (3)  EMBED Equation.3  (4)  EMBED Equation.3  (5)  EMBED Equation.3  Method #3: ELIMINATION - eliminate one variable from both equations STEP #1: Put both equations in SAME FORM (Ax + By = C) STEP #2: SELECT A VARIABLE to eliminate (x or y) STEP #3: As needed, make that variable in both equations have same coefficient values (ex: -3x and 3x OR 2x and 2x) by MULTIPLICATION to each equation. (LCM can help) STEP #4: ADD or SUBTRACT the two equations together to eliminate that variable term STEP #5: Solve the resulting one-variable equation STEP #6: Find the value of the eliminated variable by substituting previous solution into one of the given equations STEP #7: Write solution as an ordered pair Example of Step-by-Step: ELIMINATION METHOD Solve  EMBED Equation.3 by elimination Both equations already in same form (roughly standard) Eliminate y: y-terms are -5y and 1y LCM of 5 and 1 = 5 Multiply second only equation by 5  EMBED Equation.3 ( Now System:  EMBED Equation.3   ADD Equations  EMBED Equation.3  Solve equation  EMBED Equation.3  Substitute solution back into one of the original  EMBED Equation.3  EMBED Equation.3  Solution:  EMBED Equation.3  or (-3.08, -5.23) Same solution as substitution and graphing PRACTICE SOLVE BY ELIMINATION: (1)  EMBED Equation.3  (2)  EMBED Equation.3  (3)  EMBED Equation.3  (4)  EMBED Equation.3  (5)  EMBED Equation.3  (6)  EMBED Equation.3  Math 3 Honors: Unit 6 Name: __________________________________ SOLVING SYSTEMS OF EQUATIONS GENERAL PRACTICE While GRAPHING, SUBSTITUTION, and ELIMINATION Methods will find the same solution to a given system of equations, each one has advantages and disadvantages based on the initial set up of the system. I. Solve each system of equations by GRAPHING Show y-intercept form of your equations  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  II. Solve each system of equations by SUBSTITUTION  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  III. Solve each system of equations by ELIMINATION  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  SYSTEM OF EQUATION WORD PROBLEMS Read the problem Carefully and Identify Any Important Information Define Variables (x and y) Write a system (2 equations) with variables Solution Method: Based on your equations, decide on the best method (Graph, Substitution, Elimination) Answer the QUESTION The sum of two numbers is 200 and their difference is 28.What are the two numbers? 100 cans and 300 bottles were bought for $450. 200 cans and 200 bottles were bought for $400. What is the cost of an individual can and bottle? Arsene saves $55 per week and already has saved $270. Jose has $990 and spends $35 per week. How many DAYS until Arsene and Jose have the same amount of money? There are a total of 800 students in a high school. Twice the number of upperclassmen is 98 less than the number of underclassmen. How many upper and underclassmen are in the high school? A total of 10,000 king and queen sized sheets were sold by a warehouse. A king sized sheet costs $25 and a queen sized sheet costs $20. All 10,000 sheets were sold for a total of $227,000. How many queen sheets were sold? The width of a rectangle is 5 times larger than the length of the rectangle. The perimeter of the rectangle is 360 units. What are the measurements of the length and width? The length of a rectangle is 10 more than twice the width. The perimeter is 70 units. What is the area of the rectangle? Stephan has been gaining weight at 1.5 pounds a week from his original weight of 120 pounds. Seth is losing weight at 2.5 pounds a week from his original weight of 184 pounds. How much will Seth and Stephan weigh when they are the same weight? Georgia bought 3 pens and 4 notebooks for $26.50 from the bookstore. She later bought 7 pens and 5 notebooks for $41.25 from the same bookstore. How much would you have to pay for 2 pens and 2 notebooks? You are able to buy 4 tacos and 6 burritos for $62.58 or you could buy 5 burritos and 7 tacos for $66.78. How much would 3 burritos cost? Two numbers have a sum of 117. The larger number is 42 less than twice the smaller number. What are the numbers? Nancy has 113 coins that are all dimes and quarters. The value of the coins is exactly $20.00. How many dimes and quarters does Nancy have? Two numbers have the difference of 38. The larger number is 5 more than quadruple the smaller. What are the numbers? Mr. Grimstead is writing a test for his Algebra 2 class. It will have multiple choice questions that are worth 4 points each and true/false questions that are worth 3 points each. 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