- 8.SP.1.1 Tony collected data on the years of
employment and the annual salaries of the
salespeople at Company Z. He made a
scatterplot and drew a trend line that
approximated the line of best fit for the data, as
shown below. What is the slope of the trend
line that Tony drew? Show or explain how you
got your answer.
Salaries of Salespeople at Company Z
$71,500
$60.000
(9.555,000)
Salary
$50,000
500.000
$30,000
1 2 3 4 5 6 7 8 9 10
Years of Employment

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Given the graphed function below which of the following orders pairs are found on the inverse function

Complete the equation of the live through (-1,6) (7,-2)