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Mathematics 7 Online
OpenStudy (helpkay):

will fan and give medal please help @kelsey.benton00 @rishavraj

OpenStudy (mathwizzard3):

What is it on?

OpenStudy (helpkay):

The equation below represents Function A and the graph represents Function B:

OpenStudy (helpkay):

wrong one

OpenStudy (mathwizzard3):

okay

OpenStudy (helpkay):

OpenStudy (helpkay):

@rishavraj

OpenStudy (helpkay):

@kelsey.benton00

OpenStudy (helpkay):

I look and found that the answer is A but I don't know why

OpenStudy (helpkay):

i know the slope is 1 for part b

OpenStudy (kelsey.benton00):

Do you know the concept of rise over run?

OpenStudy (helpkay):

yes go up then over divide that and get your slope

OpenStudy (aveline):

Yeah, so they slope of function b is 3, how does that compare to 6?

OpenStudy (aveline):

*the

OpenStudy (kelsey.benton00):

Right. So for the first equation, in any equation that is formatted y=mx+b , then m is always going to be the slope. So if the slope for the first equation is not 1, what is it?

OpenStudy (kelsey.benton00):

In other words, what is m?

OpenStudy (helpkay):

? how is it 3 you go up 1 and aver 1

OpenStudy (kelsey.benton00):

You go over 1 and up 3

OpenStudy (kelsey.benton00):

The first equation doesn't give you a graph so you have to determine the slope based off of the equation alone

OpenStudy (aveline):

One of the points is (-1,-2), another is (1,4) y2-y1/x2-x1 is the slope, so: (4)-(-2)/1-(-1) is the slope 6/2 = 3 = m

OpenStudy (helpkay):

? you do rise over run not run over rise and how is it up 3

OpenStudy (kelsey.benton00):

Rise/Run = 3/1

OpenStudy (aveline):

You rise 3 and go over 1. The equation for the graph is y=3x+1

OpenStudy (kelsey.benton00):

^

OpenStudy (helpkay):

I don't get what you are saying but ok

OpenStudy (kelsey.benton00):

So because the slope for the second equation is 3, and because the slope for the first equation is 6, the slope for graph A would be twice that of Graph B -> Hence the reason the answer would be A.

OpenStudy (kelsey.benton00):

What do you not understand?

OpenStudy (helpkay):

how you got the slope

OpenStudy (kelsey.benton00):

Okay, look at the graph, and find point (-2,-5). Found it?

OpenStudy (helpkay):

ok

OpenStudy (aveline):

Now move to (-1,-2). How far do you move right? How far do you move up?

OpenStudy (kelsey.benton00):

^ Exactly

OpenStudy (helpkay):

i see what you did you pick 2 points subtracted them to get your slope

OpenStudy (kelsey.benton00):

Sort of, but it doesn't have to be that complicated. You just have to pick two points that the line intersects, and then count how many you have to move over to get directly beneath the second point, and that is the run, and then how many you have to move up to get to the point, and that's the rise. Then you just divide the rise by the run, and that's your slope.

OpenStudy (kelsey.benton00):

There's also a formula for it, where you can use two given points, which @Aveline pointed out earlier: y2-y1/x2-x1 The / stands for division, just to be clear.

OpenStudy (helpkay):

i see that now thank you all for you help

OpenStudy (kelsey.benton00):

No problem (:

OpenStudy (math&ing001):

Kudos to you @kelsey.benton00 and @Aveline for making this simple enough to understand. Great job !

OpenStudy (kelsey.benton00):

@math&ing001 Thanks, appreciate that (:

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