Name Period Date Ch. 5 Systems of Linear Equations Review Guide
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1 Reteaching 5-1 Solving Systems by Graphing ** A system of equations is a set of two or more equations that have the same variables. ** The solution of a system is an ordered pair that satisfies all equations in the system. One method of solving a system of linear equations is to graph each equation and find any intersecting points. Make sure your equations are in slope intercept form (y = mx + b)! y = x 3 The slope is 1. The y-intercept is 3. y = x + 1 The slope is l. The y-intercept is 1. The lines appear to intersect at (2, -1). ** Check: ** y = x 3 y = x + 1 1=2 3 1 = (2) = 1 1 = 1 The solution of the system is (2, 1).
2 Reateaching 5-2 Solving Systems by Substitution You can solve systems of equation by substitution. 2x + 4y = 2 Step 1 y = -x + 8 Solve one of the equations for one of the variables. Write the second equation. Subtract x from both sides. Step 2 Substitute - x + 8 for y in the other equation. 2x + 4y = 2 Write the first equation. 2x + 4(-x + 8) = 2 Substitute x + 8 for y. 2x 4x + 32 = 2 Use the Distributive Property. 6x + 32 = 2 Simplify. 6x = 30 Subtract 32 from each side. x = 5 Divide each side by 6. Step 3 Substitute 5 for x in either equation and solve for y. Write either equation. 5 + y = 8 Substitute 5 for x. y = 3 Subtract 5 from both sides. The solution is (5,3).
3 Reateaching 5-3 Solving Systems by Elimination You can solve some systems of equations by adding (or subtracting). Step 1: Eliminate one variable. 2x + 3y = 12 x- 3y= - 3 3x + 0= 9 Add x = 3 Solve for x. Step 2: Substitute the value you found into one equation. 2x + 3y = 12 Write either equation. 2(3) + 3y = 12 Substitute 3 for x y = 12 Simplify. 3y = 6 Divide by 3. y = 2 Solve for y. The solution is (3,2). ** You can solve some systems of equations by subtracting. ** Step 1: Eliminate one variable. 3a + 2b = 3 - (3a+ b= 0) b = 3 Subtract. Step 2: Substitute the value you found into one equation. 3a + 2b = 3 Write either equation. 3a + 2(3) = 3 Substitute 3 for b. 3a + 6 = 3 Simplify. 3a = 3 Divide by 3. a = 1 Solve for a. The solution is ( 1,3).
4 Reateaching 5-3 (Cont.) Solving Systems by Elimination **You can solve some systems of equations by multiplying. ** 3x + 2y = 14 6x + 4y = 4 Step 1: To eliminate x, multiply each side of the first equation by 2. Then add. 2(3x + 2);) = 2(14) 6x + 4y = 28 6x + 4y = 4 6x + 4y = 4 8y = 32 y = 4 Step 2: Substitute 4 in either original equation and solve for x. 3x + 2y = 14 Use the first equation. 3x + 2(4) = 14 Substitute 4 for y 3x + 8 = 14 Simplify. 3x = 6 Subtract 8 from each side. x = 2 Divide each side by 3. The solution is (2,4).
5 Reteaching 5-4 Systems in the Real World There are several different ways to solve systems of equations. You can use any method to solve real-world problems. Method Graphing When to Use Methods for Solving Systems of Equations When you want a visual display of the equations When you want to estimate a solution Substitution When one question is solved for one of the variables When it is easy to solve for one of the variables Elimination When the coefficients of one variable are the same or additive inverses Example of how to set up a system of equations from a word problem: Brenda's school is selling tickets to a spring musical. On the first day of ticket sales the school sold 3 senior citizen tickets and 9 child tickets for a total of $75. The school took in $67 on the second day by selling 8 senior citizen tickets and 5 child tickets. What is the price each of one senior citizen ticket and one child ticket? We need to come up with 2 equations with two variables for each equation. First we need to define our variables Let x = price of a senior citizen ticket Let y = price of a child ticket. Now, let s write our equations that model what our situation is in words: 3x + 9y = 75 [3 senior tickets and (+) 9 child tickets sold for total (=) $75.] 8x + 5y = 67 [8 senior tickets and 5 child tickets sold for total $67.] Finally, we can use any method we prefer to solve this system. What method looks best (or easiest) to you? [I would use substitution and get x by itself with the first equation.]
Name Period Date. ** A system of equations is a set of two or more equations that have the same variables.
Reteaching 5-1 Solving Systems by Graphing ** A system of equations is a set of two or more equations that have the same variables. ** The solution of a system is an ordered pair that satisfies all equations
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