Math
posted by Jessica on .
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
4x3y=21
4x2y=6

y=3 , x=3

x+y=21(*)
3x4y=0 (**)
(*)=>x=21y
Replace to (**):=> 3(21y)4y=0
=>633y4y=0
<=>7y=63=>y=63/7=9
y=9 replace (*)=>x=219=12
=>x=12
y=9