Question

what did I do wrong

Answer 1

for part A I did

Part A (2,225) (5,480)

5- 2/ 480-225

-3/-255

y-225=85(x-2)

y-225=85x+170

y-225+225=85x+170+225

y=85x+395

-85x +y= -85 + 85+395

-85x + y= 395

-1(-85x + y= 385)

85 - y = -5

Answer 2

What level of math are you in? I was stumped by this yesterday xD

Answer 3

\(\large\bf Slope = \frac{y_2-y_1}{x_2-x_1}\)

That's where you made your first mistake

Answer 4

Once you get the correct slope, you should be able to do do the rest correctly

Answer 5

I'm doing algebra 1

Answer 6

I did
5- 2/ 480-225

-3/-255

Answer 7

It's y over x.

Answer 8

You did it backwards.

Answer 9

oh

Answer 10

@helpkay I know that is what you did.

You need to flip it. The y-values go on top, and the x-values go on the bottom.

Answer 11

I think I did the same thing when I did it yesterday, why must calc students be burdened by this common mistake.

Answer 12

so

225 -480 / 2-5

Answer 13

Yes

Answer 14

Much better. But please enclose those two differences in parentheses.

for part A I did

Part A (2,225) (5,480)

5- 2/ 480-225 should actually be m=slope= \[\frac{ (480-225) }{ (5-2) }\frac{ dollars }{ day }=slope~ (m)\]

Answer 15

Now that you have the slope, choose one of the two given points (doesn't matter which one) and substitute its x- and y-components into the point-slope form of the equation of a straight line:

\[y-y _{1}=m(x-x _{1})\]

Answer 16

Finally, solve the resulting equation for y in terms of x. The units of measurement will be dollars.

Answer 17

-255/-3

Answer 18

which = 85 so 85 is your M right

Answer 19

Yes

Answer 20

You are saying that $85 is the rental charge per day. Does that sound reasonable?

Now that you have the slope, choose one of the two given points (doesn't matter which one) and substitute its x- and y-components into the point-slope form of the equation of a straight line:

y−y1=m(x−x1)

Answer 21

ok so I do

y-2=85(x-225)

Answer 22

I'll try, I answered this differently yesterday.

Answer 23

Yeah, I'm pretty stumped, I'm too rusty on this sort of stuff.

Answer 24

As mathmale said, you are going to use y-y1=m(x-x1)
y-2=85(x-225)
This would be incorrect since the x and y values are switched

This is correct:
y-225=85(x-2)
Let's simplify:
y-225=85x-170
y=85x+55

Answer 25

@helpkay
Does this make sense?

Answer 26

y-2=85(x-225)
I used that, no wonder I couldn't get an answer.
Q_Q

Answer 27

Shouldn't have peaked at your work for a shortcut @helpkay haha :D

Answer 28

yes but wouldn't be -3

Answer 29

-3?

Answer 30

never mind

Answer 31

i got it

Answer 32

Ok good

Answer 33

hey i need help tomorrow after church will you be on here @11-12 tomorrow

Answer 34

@Aveline could you help real quick

Answer 35

y-225=85x-170

how do you get 55 i know you bring the 225 over but i don't get how you add it

Answer 36

You add 225 to each side. This means that you add 225 to -170, which equals 55

Answer 37

i am so dumb i should have known that thanks

Answer 38

No problem