Intermediate Algebra (11th edition)

TECHNOLOGY INSIGHTS EXERCISES 73 – 76 222 CHAPTER 4 Systems of Linear Equations –10 10 10 –10 –10 10 10 –10 73.The table shown w ...

80.Sharon Kobrin compared the monthly pay- ments she would incur for two types of mortgages: fixed rate and variable rate. Her o ...

Use the graph shown in FIGURE 1at the beginning of this section (and repeated here) to work Exercises 83 – 86. 83.For which year ...

You read the directions wrong. You read the question wrong or skipped over something. You made a computation error. You made a ...

Theoretically, a system of this type can be solved by graphing. However, the graph of a linear equation with three variables is ...

OBJECTIVE 2 Solve linear systems (with three equations and three vari- ables) by elimination.Since graphing to find the solution ...

Solving a System in Three Variables Solve the system. (1) (2) (3) Step 1 Since zin equation (1) has coefficient 1, we choose zas ...

Step 6 It appears that the ordered triple is the only solution of the system. We must check that the solution satisfies all thre ...

NOW TRY We can find yby substituting for zin equation (2). (2) Let Add 6. or Divide by 8; lowest terms Check to verify that the ...

SECTION 4.2 Systems of Linear Equations in Three Variables 231 Solving Another Special System Solve the system. (1) (2) (3) Mult ...

Solve each system of equations. See Example 2. 232 CHAPTER 4 Systems of Linear Equations 15. 1 2 x+ 3 2 y+ 3 4 z= 21 - 3 4 x- 1 ...

Brain Busters Extend the method of this section to solve each system. Express the solution in the form 1 x, y, z, w 2. SECTION 4 ...

OBJECTIVE 1 Solve geometry problems by using two variables. Finding the Dimensions of a Soccer Field A rectangular soccer field ...

Step 4 Solvethe system of equations. Since equation (2), is solved for L, we can substitute for Lin equation (1) and solve for W ...

Step 4 Solvethe system. To eliminate h, multiply equation (2), by and add. (1) Multiply each side of (2) by. Add. Divide by. To ...

Step 3 Write a system of equations.When the xounces of 5% solution and the younces of 20% solution are combined, the total numbe ...

Step 3 Write a system of equations.The car travels 8 km per hr faster than the truck. Since the two rates are xand y, (1) Both v ...

Solving a Problem Involving Prices At Panera Bread, a loaf of honey wheat bread costs $2.95, a loaf of sunflower bread costs $2. ...

Solving a Business Production Problem A company produces three flat screen television sets: models X, Y, and Z. Each model X se ...

3.Venus and Serena measured a tennis court and found that it was 42 ft longer than it was wide and had a perimeter of 228 ft. Wh ...