http://prntscr.com/8sjdml

Question

diana.xl · Answer

So is this correct like this?

@Directrix

directrix · Answer

Yes. Are you supposed to solve the two equations?

diana.xl · Answer

yea

diana.xl · Answer

Solve the system using the elimination method. Show all the steps leading to your
answer.

diana.xl · Answer

im a bit confused about this one tho.

directrix · Answer

I would multiply the second equation by 100 to eliminate the decimals.

directrix · Answer

Then, you would have:

x + y = 27
25x + 10y = 450
---------------

directrix · Answer

Can you solve that? I would then multiply the first equation by -10 to eliminate the y variable.

directrix · Answer

x + y = 27
.25x + .10y = 4.50
----------------------
x + y = 27
25x + 10 y = 450
-----------------
-10x -10y = -270
25x  + 10y = 450
--------------------
15x     + 0y   =  180
            15x    = 180
---------------------
                  x =   12
             x + y = 27
           12 + y = 27
                    y = 15
         12 quarters and 15 dimes

directrix · Answer

Your work is not correct. You have to multiply through by -10 to eliminate the y.

If you add the two ys you have you will get 20y and they will not add out.

diana.xl · Answer

oh ok

diana.xl · Answer

Thank u.

directrix · Answer

You are welcome. I'm attaching a graphic showing where yours went wrong if you can read my sloppy writing.