Sunday

January 25, 2015

January 25, 2015

Posted by **Jessica** on Sunday, October 22, 2006 at 12:49pm.

Question...

x+y=21

3x=4y

Answer I got...

x=84 y= -63

I didn't get that. Check your math. I found 7y=63 but not y = 63.

You can always check your answer. Is 4X = 3Y.

3*84 = 4*63 yes, it is.Is X + Y = 21. No, it isn't. I always check my answers before I call it quits on a problem.

yyes you are right

wat is the answer to this ?

w+4(w+3)

solve by elimination

4x-3y=21

-4x-2y=-6

- Math -
**seng kong long**, Saturday, December 26, 2009 at 7:02pmy=-3 , x=3

- Math -
**Leyla**, Saturday, November 17, 2012 at 3:32amx+y=21(*)

3x-4y=0 (**)

(*)=>x=21-y

Replace to (**):=> 3(21-y)-4y=0

=>63-3y-4y=0

<=>7y=63=>y=63/7=9

y=9 replace (*)=>x=21-9=12

=>x=12

y=9

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