Math

Hi, would someone mind just checking the answer I got for this formula and tell me if I'm on the right track or not.
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

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  1. y=-3 , x=3

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  2. x+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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