Homework Help Forum: 8th Grade Math

Posted by Sarah on Thursday, September 24, 2009 at 8:00pm.

If x/y=4, x-y=9, and y-x=(-9) then what is x and y?

• 8th Grade Math - Christiaan, Thursday, September 24, 2009 at 8:05pm

  from the first equation, x/y=4, we can find that x=4*y. If we fill this in into the second equation, we get that: x-y=9 <=> (4*y)-y = 9 <=> 3*y=9 <=> y=3 Knowing that y=3, we fill this in into our first equation and we get that: x=4*y, so that x=4*3=12 So, y=3 and x=12

  
  

• Re: Christiaan - Sarah , Thursday, September 24, 2009 at 8:12pm

  Thank u sooo much!! I couldn't have gotten it by myself. =D

  
  

• 8th Grade Math - Gregory, Tuesday, September 29, 2009 at 11:14pm

  Name the ordered pair if the x-intercept is -2.

  
  

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