anonymous
  • anonymous
how do i figure this inequality: 3x-7y>21
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
Are you solving for y?
anonymous
  • anonymous
i really dont know i think im supposed to find out if the left side of the inequality is greater than the right side
anonymous
  • anonymous
Well it depends on what x and y is. However based on the looks of the problem (and my experience with people who have the same questions), they are probably wanting you to solve for y.

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anonymous
  • anonymous
idk my math teacher told me to use the coordinates (0,0)
anonymous
  • anonymous
That would change things slightly (you probably should have wrote that with the problem). If you are using the coordinates (0,0), then you will substitute 0 for x and 0 for y. Then you will have 3(0)-7(0)=0. However, is 0 greater than 21?
anonymous
  • anonymous
no it isnt but problem is my graph only goes to ten
anonymous
  • anonymous
Are you using a graphing calculator? If so which one?
anonymous
  • anonymous
im bnot its a take home test and thats as long as they made the graph i was wondering if there was a way to simplify it
anonymous
  • anonymous
Solve for y. Then you can subtract 3x from both sides of the inequality, so -7y>21-3x. Then divide both sides by -7; however, do you know what happens to the inequality when you divide by a negative sign?
anonymous
  • anonymous
ummmm is it that -7y gets divided by 21-3x which would make the inequality y>-3-(-3/-7) right?
anonymous
  • anonymous
Umm not quite. What I meant to say is, when you divide by a negative sign (-7 in your case), the inequality sign ">" will turn the opposite direction ("<"). You can flip the direction only if you divide by a negative (this is a good thing to know). So your inequality should be y< (21-3x)/(-7)
anonymous
  • anonymous
oh ok i see it now thankyou
anonymous
  • anonymous
Is there any step that did not make sense?
anonymous
  • anonymous
no my math teacher goes to fast in class so i dont get most of it but you made it very clear to me now thankyou
anonymous
  • anonymous
You're welcome!
anonymous
  • anonymous
ok thats all

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