Question

Which of the following points lies on the line whose equation is y = 2x - 3?

(0, 3)
(1, -1)
(-1, 4)

Answer 1

@sleepyjess

Answer 2

Substitute in the x value for each coordinate and see if it matches the y value

Answer 3

???

Answer 4

Take the x coordinate from each option and substitute it in for x in the equation

Answer 5

How am I supposed to know if it equals y?

Answer 6

by substituting in x

Answer 7

Here, I'll show you option A.
y = 2x - 3
coordinate = (0, 3)
x = 0
y = 2(0) - 3
y = 0 - 3
y = -3
Is the y coordinate -3? No, so A is not correct.

Answer 8

Now just do that for the other 2 options and you will find the answer.

Answer 9

Where are you having doubts?

Answer 10

In each option, you are given x and y value..
Just put them in your equation and find out if Left Side = Right Side or not..

Answer 11

Like, I try first option and you will try other two:
(0,3) ----> It means \(x=0, y=3\):
So:
\(y = 2x-3 \implies 3 = 2(0) - 3 \implies 3 \ne -3\)

Answer 12

As 3 is not equal to -3, so first option is not right.. Getting?

Answer 13

Then encourage her to check for other two options left, @sleepyjess

Answer 14

I did...

Answer 15

No. I did what @sleepyjess said to do and found the answer. I don't just "guess" in school.

Answer 16

hey, I want to just see your steps for second option, can you now please show that to us or not?

Answer 17

No.

Answer 18

No problem. I just don't see the point of having to take the time to show my work on this website when I don't even have to do it for school.

Answer 19

This attitude is neither good nor it is going to help you.
We won't tell you the right answer, but we give a hint that, check for both second and third options, otherwise you will end up doing it wrong.. :)
Good day..!!!

Answer 20

I did check the answers. But I don't feel the need to show my work to you two when I don't even have to for my teachers.

Answer 21

We could have already been done by now...

Answer 22

Right? Lol

Answer 23

I don't see why you don't want to just show to work for the second option. Maybe we are getting a different answer and want to see why you are getting what you are.

Answer 24

I know I have the correct answer. It doesn't need to go on any further.

Answer 25

Okay, all we wanted to do was check your answer.

Answer 26

How to properly use Desmos to check an answer like this is to graph all parts. Not just the line, but also the points.

https://www.desmos.com/calculator/6ttghsuqjp

As you can see, only one of the dots is on the line. However, this does not explain the math behind it so it should only be used as a check after you do the math. Why? If you need to take a state test to graduate or need to use this in college, you won't have the web site to use.