Question

Choose the equation below that represents the line passing through the point (2, – 5) with a slope of −3. I also need help using a graphing calculator and which is the best online one to use?

Answer 1

Hi
Welcome to OpenStudy :)
Online graphing calculator to use: https://www.desmos.com/calculator
And please post your options! :)

Answer 2

y = −3x − 13
y = −3x + 11
y = −3x + 13
y = −3x + 1
I have been using desmos but I don't understand how. Thanks!

Answer 3

y=mx+b
m=slope
b=y-intercept
What have you done so far?

Answer 4

\[y = -3x + \frac{ 2 }{ -5 }\]

Answer 5

Pooja had to leave, so she asked me to help you finish up. :)

Answer 6

What do I do next? I posted the equation. Is that correct from the information I was given?

Answer 7

ok, I see you got the slope correct, but you didn't get the y-intercept correct.

You were given the point (2, -5)

to find the y-intercept, you do not make it 2/-5

To find the y-intercept you plug it back in to the equation

so we have y = mx + b

we know m which is the slope is -3. What do we have now?

y = -3x + b

b is the y-intercept and is what we're trying to find :)

now plug in the point. (2, -5) is in the form of (x, y)

so that means plug in x = 2 and y = -5 and solve for b, also known as the y-intercept :)

Answer 8

So -5 = -6 + b?

Answer 9

correct, now add 6 on both sides to solve for b :)

Answer 10

Ok, how do I use a graphing calculator?

Answer 11

to use a graphing calculator for this question, I would plug in the point they gave you and then plug in the answer choices to see which equation goes through the point

Answer 12

How? I have never even seen one in my life :P

Answer 13

https://www.desmos.com/calculator/ktvrpmgcyi

Answer 14

Thank you!

Answer 15

Anytime! :)