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Can you give me an example?
ok one second
g=5x+xy+7y solve for x
In terms of g and y?
so bunch all the x's on one side. in this case, can be done by subtracting 7y to the left side, and you now have g-7y=5x+xy.
now factor out x from the left side. now it looks like: g-7y=x(5+y)
divide by (5+y) and you have (g-7y)/(5+y)=x
That answer your question?
Yup! I get it! Can you solve this example too? 2y - 2/3x + 6 = 0 solve for y
can you put in the () where they go, b/c that could either be (2y-2)/(3x+6)=0 or 2y-(2/3)x+6=0
the second one
OK. You try it first, or at least tell me where you're getting stuck. I feel like I'm giving you all the answers, and I want you to learn something not just copy all the answers down
Actually I'm doing them and then comparing your work to mine xD But cool here's my work: So I start with 2y-2/3x+6=0. I move over the 6 to the other side. 2y-2/3x=-6. I add -2/3x on both side to move it. 2y=-6+2/3x. I divide everything by 2. y=-3+1/3x. I'm really not sure how to divide a fraction so I just thought. What's half of 2/3? 1/3! Is that right? here's my final answer: y=-3+1/3x
Yes, it is. Dividing fractions is very easy though, and you should know how to do it.
1/2 * 1/2 is what? 1/2 divided by 1/2 is what?
I know it's like multiply by negative reciprical but I don't get it very much :/
not negative reciprocal just reciprocal :)
1/2 by 1/2 is 1/4. 1/2 divided by 1/2 is 1?
yes. so what's 45/79 divided by 11/37?
and while you're at it, what's 3 and 4/5 divided by 5/6?
Holy crap. Um, 1665/869? Do you mean 3 divided by 5/6 and 4/5 divided by 5/6? or 19/5 divided by 5/6?
the 2nd one.
So I just cross-multiply basically?
it's a lot easier if you just flip the fraction you're dividing by and multiply.
But yes, essentially the same thing.
so do that in the previous problem 2/3 divided by 2.
2/3 times 1/2 is 2/6. Simplified is 1/3. Okay! Well I got it right with my reasoning anyway but thanks for that! I really needed to know that(:
great! i'm glad i could help.
So did I get that first problem right? The one I explained step by step?
Yes. You should have more confidence in your math skills. once you learn the basic equations and formulas, it's really easy.
Ahaha thanks(: I just have a quiz tomorrow and I have the WORST memory. Let me see if I have this right- point slope form is y-y1=m(x-x1). Standard form is Ax+By=C *no fractions, x must be positive*. Direct variation y=kx k=y/x (use proportions). Inverse variation y=k/x k=yx. Literal equations factor binomials, to divide fracions multiply by reciprocal. AND THERE'S MY WHOLE NIGHT(:
yeah :). keep in mind for the variation stuff all you really need to memorize is y=kx and k=yx for direct and inverse variation, respectively. from there you can divide by x by direct var. and get k=y/x or divide by x by inverse var. and get y=k/x.
So basically dir. var. is y=kx. In. var. is y=k/x right?
or k=yx. same thing.
for which inverse variation?
k=yx divide by x k/x=y Same thing!
AND I'm done studying for the night.(: I'll be back soon ahaha
Thank you SOOOOO much you have no idea what this means to me (:
no problem. happy to help!