Posted by **Josh** on Saturday, July 9, 2011 at 6:15pm.

x+y=9.0

0.50x+0.20y=3.90

What is the value of x and y?

- Chemistry -
**DrBob222**, Saturday, July 9, 2011 at 7:16pm
I would do this.

x+y = 9.0

0.50x + 0.20y = 3.90

------------------Multiply eqn 1 by -(1/2).

-0.50x - 0.50y = -4.50. keep eqn 2 as is.

0.50x + 0.20y = 3.90

-----------------------Now add the two. You see the x term cancels. Solve for y, then substitute y back into one of the equation and solve for x.

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