Quiz Section 4.1-4.2

Q5 The following scatter diagram shows heights (in inches) of children and their ages.Height (inches)

3 years guey

Q8 Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.

Graphing utility to draw a scatter diagram 1) Place data into L1,L2 - push STAT and select Edit 2) To view scatterplot -- -push 2nd,y= (stat plot),enter -turn on the plot 1 on *scatter) -push zoom stat Use a calculator to find the linear function of best fit that models the relationship Using linreg - push stat -select calc -select line reg -enter You get the numbers * for this problem you get y = 3

Q2 Use the slope and y-intercept to graph the linear function. f(x) = 3x - 1

In an situation like this, we must follow: 1. Recall that this is in slope intercept form 2.Identify slope= 3, and the y intercept = -1 3. Remember that if y=-1, then we can assume X=0.As a result, we will utilize the point (0,-1) 4. We then place slope in the correct form, in this case 3/1 *Rise 3 *Run 1 5. We then plug in the point (0,-1), and apply slope to give us the graph of this linear function

Q1 Determine the slope and y-intercept of the function.f(x) = 10x + 5

In this case we known that m= 10 y=5

Q4 Draw a scatter diagram of the given data. Find the equation of the line containing the points (2, 1.0) and Graph the line on the scatter diagram.

In this case, we know that we will be using the points (2,1.0) and (9,4.4) to find the equation. 1. Find the slope for the two points using the following: (y2-y1)/(x2-X1) = 0.49 2. Now we use point-slope form to find the equation using the lope m and the points (2,1.0) *point slope form = y-y1=m(x-x1) = 0.02 y=0.49X+0.02

Q3 Determine the average rate of change for the function. f(x) = 3/4x+1

The ROC = slope = M M = 3/4

Q6 Determine if the type of relation is linear, nonlinear, or none.

We know this is linear (begatie)

Q7 Determine if the type of relation is linear, nonlinear, or none.

nonlinear - it's more like curved

Q10 Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.

y = -6.2x + 140.4

Q9 Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.

y = 0.90x - 3.79