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.

## Answer This Question

## Related Questions

- Math - .50x+.20y=3.60 x+y=9
- Calculus. Please help! - Find the minimum value of the function f(x,y= 25x^2+3y^...
- Math - Given These Equations x+y=9.0 .50x+.20y=3.90 Find the values of X and Y.
- math - A cab charges $1.50 for the first mile and $0.50 for each additional mile...
- FInite Math - -.30x+.20y +.25z =0 .20x -.40y +.05z =0 .10x +.20y -.30z =0 x=? y...
- FInite Math - -.30x+.20y +.25z =0 .20x -.40y +.05z =0 .10x +.20y -.30z =0 x=? y...
- Pre-Calculus - Find the slope of the tangent line to the curve 2(x^2+y^2)^2=25(x...
- Math - the product (2x^4y)(3x^5y^8) is equivalent to? a.5x^9y^9 b.6x^9y^8 c.6x^...
- math - need to know how to find the distrbutive property of 50x62,159= (50x )+(...
- math - Identify the slope and the y-intercept for the line associated with the ...

More Related Questions