Can someone help me out with this system?
x+y=23
9x-7y=27

Question

Can someone help me out with this system?
x+y=23
9x-7y=27

abb0t · Answer

I am sure you are familiar with method of substitution and or elimination, yES?

anonymous · Answer

yes @abb0t

abb0t · Answer

Which one are you more comfortable working with here?

abb0t · Answer

LOOOOL!

anonymous · Answer

@abb0t substitution is the one I am more comfortable with

abb0t · Answer

Ok. Well then here, this is what you will do
you have two equations:

$\sf \color{red}{x+y=23}$
$\sf \color{blue}{9x-7y=27}$
what you're going to do is rearrange one of those, i would suggest the one in red, to $\sf \color{red}{y=23-x}$. notice that you have y = f(x). Take that f(x) - function and plug it into the blue equation! And solve for $x$.

$\sf \color{blue}{9x-7(}$$\sf \color{red}{23-x}$$\sf \color{blue}{)=27}$
you know what to do now. distribute, solve for $x$.

anonymous · Answer

@abb0t you are awesome! Thanks

abb0t · Answer

Once you solve for $x$. You get a numerical value. That numerical valye that you get for $x$. You can now use to solve for $y$ in equation red.

abb0t · Answer

You can always check if your values are correct or not correct by plugging in the values for $x$ and $y$! They should equal 23 or 27! If they do not, then you did something wrong. Good luck.