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Mathematics 19 Online
Blank:

Algebra

Blank:

On the graph of the equation x − 4y = −16, what is the value of the y-intercept?

TheSmartOne:

We can rearrange the equation to be in the form of y = mx + b and find the y-intercept quickly. Or we can graph it using https://www.desmos.com/calculator

TheSmartOne:

Undead, no idea what you're trying to say. LOL.

Blank:

Okay I also noticed some questions here are from the first practice test so It'll be easier

undeadknight26:

4 = y. 4y...

Blank:

Is -4 the y-intercept

undeadknight26:

;~; Coff coff ;~; I run away now T^T

TheSmartOne:

x − 4y = −16 Add 4y to both sides and add 16 to both sides 4y = x + 16 Divide 4 on both sides. What do you get? :)

Blank:

y = 1/4x - 4

TheSmartOne:

But we have x \(\color{red}{+}\) 16\)

Blank:

+4

TheSmartOne:

Yes, the y-intercept is +4 or just 4 xD

undeadknight26:

;~; This is what I said earlier ;~;

Blank:

Below are two different functions, f(x) and g(x). What can be determined about their y-intercepts? f(x) = x + 4 g(x) x: -1, 1, 2 g(x): 8, 0, 4

TheSmartOne:

Undead, first of all, y = 4 is not how you show what the y-intercept is If you said b = 4, that would make more sense. y = 4 is a horizontal line that has a y-value for any given x-value.

TheSmartOne:

What's the y-intercept of f(x)? :) y = mx + b b is the y-intercept

Blank:

4

Blank:

umm

TheSmartOne:

I'm back :P

TheSmartOne:

4 is the y-intercept for f(x) correct can you find the y-intercept of g(x)?

TheSmartOne:

I had written a huge response but then it glitched out and so it went all away :P

Blank:

it's 4

Blank:

they're the same?

TheSmartOne:

there's the one normal way to do this by finding the slope and then plugging a point and solving for the y-intercept or for this question, I see that they gave x = -1 and x = 1. We can find the midpoint of the two points because the midpoint will be (0, b) and b is the y-intercept yeah, the y-intercept is 4 :)

Blank:

I opened up another question topic this one is closed

TheSmartOne:

Sure, let's move to that one xD

Infinity:

Good job. @TheSmartOne Welcome to QuestionCove. @Blank

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