<p>lol noob question</p>
<p>but which one is considered x and which one is considered y</p>
<p>like if i was to graph that would f(x) be y, or x+1 be y</p>
<p>also why.?</p>
<p>thanks</p>
<p>f(x) = y
x = x</p>
<p>^^ correct. Bt dont forget that f(x) = y = x+1 and x = x. Because f(x) is the image of x through the graph f on the y axis.</p>
<p>in barrons math 2 book it says</p>
<p>a linear function, f, has a slope of -2. f(1)=2 and f(2)=q</p>
<p>find q</p>
<p>so obviously you gotta find the slope</p>
<p>and they say the points are (1,2) (2,q)</p>
<p>that means f(x) = x
and x is y</p>
<p>either im wrong
you’re wrongg
or barrons wrong</p>
<p>They GAVE you the slope. It`s -2. Now what you should do is to use that slope to find q.</p>
<p>It becomes, -2 = (2-q) / (1-2)
This leads to q being equal to 0.</p>
<p>Now the function is linear, so the form is y = f(x) = ax + b. a is the slope (-2).So f(x) = -2x+b.</p>
<p>Then use one of the points you found out which are A(1,2) and B(2,0).
Lets use A. We have then 2 = -2(1) + b. thus b = 4.</p>
<p>So the function is f (x) = -2x + 4.</p>
<p>if you don’t know this, you’re too young to be studying for this test</p>
<p>im actually 16
taking pre-cal
got 780 on sat math
and getting around 700~ for the sat 2 math 2 practice tests</p>
<p>so…u just got pwned</p>
<p>besides that i know this is a easy question lol
i just couldn’t get it =p</p>
<p>thanks</p>
<p>Hey don`t worry. It happens to all of us! Good luck on your plans!</p>
<p>wait…dko</p>
<p>soz for some reason i am blanking on this question</p>
<p>first of all
ok they gave u the slope -2
but why does that mean it becomes
(2-q) / (1-2)</p>
<p>i know its y2-y1/x2-x1</p>
<p>so shouldnt it be 2-1/q-2</p>
<p>since they give u f(1)=2 and f(2)=q?</p>
<p>The slope of a line is m = (YA - YB) / (XA - XB) and not y2-y1/x2-x1 as you stated.</p>
<p>o thats what i meant
sorry i forgot, i just remember as that way, habit from when i was young
anyways so u said it’s
A(1,2) and B(2,0)</p>
<p>the functions are f(1)=2 and f(2)=q
f(1)= y
2= x</p>
<p>so shouldnt it be A (2,1) B (0,2)</p>
<p>?</p>
<p>im out to sleep hopefully it’ll be answered tommorow
once again
barrons explanation was</p>
<p>slope= q-2/2-1
and that f(1)=2 means it passes through points (1,2)
and f(2)=q means that it goes through (2,q)</p>
<p>why is that?</p>
<p>i always thought f(x) = y and x=x</p>
<p>very sophomoric attitude</p>
<p>*The slope of a line is m = (YA - YB) / (XA - XB) and not y2-y1/x2-x1 as you stated. *</p>
<p>These two looks the same to me; i dont see anything wrong with (y2-y1)/(x2-x1)
remember, slope is just “rise over run”.
so change in y, divided by change in x.
It doesn’t matter if its (y2-y1)/(x2-x1), or the reverse, (y1-y2)/(x1-x2), as long as u don’t get switch around the points.</p>
<p>Dko’s post shows the solution. What’s so hard about finding a missing variable?</p>
<p>m = change in y/ change in x… given slope m, and 3 values, find that missing q…
how would u find the slope if i give u 2 coordinates? same thing…</p>