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

y=-3 , x=3

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

To solve the system of equations by elimination, you need to add or subtract the equations in such a way that one variable cancels out. Here's how you can do it:

First, add the two equations together:
(4x - 3y) + (-4x - 2y) = 21 + (-6)
This simplifies to:
-5y = 15

Now, you can solve for y by dividing both sides of the equation by -5:
y = -3

Next, substitute the value of y back into one of the original equations to solve for x. Let's use the first equation:
4x - 3(-3) = 21
Simplifying this equation, we get:
4x + 9 = 21
Subtract 9 from both sides:
4x = 12
Divide both sides by 4:
x = 3

Therefore, the solution to the system of equations is x = 3 and y = -3.