Beginning Algebra, 11th Edition

79.See Exercises 77 and 78.What is the target heart rate zone for age 20? Age 40? 80.SeeExercises 77 and 78.What is the target h ...

Graphing a Linear Equation Graph At least two different points are needed to draw the graph. First let and then let in the equat ...

SECTION 3.2 Graphing Linear Equations in Two Variables^189 This gives the ordered pairs and To find a third point, we let Let Mu ...

The intercepts are and. To find a third point, we let. Let. Multiply. y=- 4 Subtract 8. 8 + y= 4 2142 + y= 4 x= 4 2 x+ y= 4 1 0, ...

SECTION 3.2 Graphing Linear Equations in Two Variables^191 We use the ordered pairs 1 - 6, - 22 , 1 0, 0 2 ,and 1 6, 2 2 to draw ...

Graphing an Equation of the Form (Vertical Line) Graph First we add 3 to each side of the equation to get All ordered-pair solut ...

SECTION 3.2 Graphing Linear Equations in Two Variables^193 The equation of the x-axis is the horizontal line ,and the equation o ...

NOW TRY 194 CHAPTER 3 Linear Equations and Inequalities in Two Variables; Functions OBJECTIVE 5 Use a linear equation to model d ...

SECTION 3.2 Graphing Linear Equations in Two Variables^195 7.Concept Check Match the information about each graph in Column I wi ...

196 CHAPTER 3 Linear Equations and Inequalities in Two Variables; Functions x y 1 1 0 x y 1 1 0 x y 1 1 0 x y 1 1 0 Find the x-i ...

Solve each problem. See Example 7. 67.The weight y(in pounds) of a man taller than 60 in. can be approximated by the linear equa ...

72.Demand for an item is often closely related to its price. As price increases, demand de- creases, and as price decreases, dem ...

Find each quotient. See Section 1.8. 5 - 1 - 72 - 4 - 1 - 12 - 2 - 1 - 42 3 - 1 - 12 - 3 - 5 2 - 7 4 - 2 8 - 5 P ...

We can summarize this discussion as follows. Slope is a single number that allows us to determine the direction in which a line ...

Moving along the line from the point to the point , we see that y changes by units. This is the vertical change (rise). Similarl ...

(b)The line through and y-value Corresponding x-value See FIGURE 23. Again, note that the same slope is obtained by subtracting ...

Finding the Slope of a Vertical Line Find the slope of the line through and Undefined slope Since division by 0 is undefined, th ...

Finding Slopes from Equations Find the slope of each line. (a) Step 1 Solve the equation for y. Subtract from each side. Divide ...

FIGURE 28shows the graphs of and These lines appear to be perpendicular(that is, they intersect at a 90° angle). As shown earlie ...

206 CHAPTER 3 Linear Equations and Inequalities in Two Variables; Functions Since the slopes and 3 are not equal, the lines are ...