Can some me with this question needs to be turned in today asap. ( question 2) the average cost of a compact car at a certain dealership over the last 10 years has ranged from $14,000 to $18, 500. suppose you were going to plot these points on a coordinate grid. a) what is a good scale to use for the y-axis? explain your reasoning. b) what is a good interval to use for the y-axis? explain your reasoning. will mark brainliest

From text

A)

A good scale to use for the y-axis is 500 for each square, starting from 14,000 to skip the irrelevant numbers less than 14,000. The numbers and range are very large, so a scale of 500 makes the y-axis about 10 squares high.

B)

A good interval to use for the y-axis is 500. Both 14,000 and 18,500 are multiples of 500.

From photo

a) I have never used point-slope form, but the equation in slope-intercept form is y = -3x + 30

Points on the graph are (3, 21) and (6, 12).

The slope is found with the equation m = (y2-y1)/(x2-x1)

m = (21-12)/(3-6)

m = 9/-3

m = -3

Sub a random point, (3,21) and m=-3 into slope-intercept form

y = mx + b

21 = -3 (3) + b

21 = -9 + b

Isolate b

b = 30

b) Initially, it took Scott 30 minutes to deliver his packages, the y-intercept. Everyday, the times decreased by 3 minutes, the slope.

y=−9/2x+10

step-by-step explanation:

let's solve for y.

0−9x−2y=−20

step 1: add 9x to both sides.

−9x−2y+9x=−20+9x

−2y=9x−20

step 2: divide both sides by -2.

−2y

−2

=

9x−20

−2

y=

−9

2

x+10

step-by-step explanation: i dont