Posted by **Tony** on Sunday, December 17, 2006 at 8:35pm.

I NEED TO SOLVE FOR Y AND X

im getting rele confused on this. ok here is the prob.

x+y=5

x-2y=-4

**equation 1 ** x+y=5

**equation 2 ** x-2y=-4

Multiply equation 1 by -1.

Add equation 1 to equation 2. The x term cancels. Solve for y.

THEN, put the value of y into either equation and solve for x.

Finally, put the value of x and y into the OTHER equation and see if those values satisfy the equation.

- MATH -
**Anon**, Thursday, July 17, 2014 at 12:19pm
Multiplying Equation 1 by -1 you get:

-x-y=-5

Adding that to equation 2 you get:

-x -y = -5

+ x -2y = -4

-------------------

-3y = -9

Divide both sides by -3 and you get

y=3

Put that back into either equation and you can solve for x

x+y=5

x+3=5

x+3-3=5-3

x=2

So x=2, y=3 should be the solutions.

Check this in the other equation, x-2y=-4

2-2(3) = -4

2-6 = -4 why yes it does! :-)

## Answer This Question

## Related Questions

- maths algebra - HI STEVE, THANKS for your reply back it was the wrong answer ...
- Math - Could someone please help me. Solve the linear equation by substitution. ...
- math,correction please.. - (x)/(x-2) - (x+1)/(x) = (8)/(x^2-2x) I keep getting x...
- math - I need help solve the equation by fractions 8/(21-y) = 12/(y+19) I think ...
- chemistry...Please Help - I posted this below and received help but im still ...
- College Algebra - "Solve each equation. Round your answers to the nearest ten-...
- Math - Can someone please help with this problem? Solve by the elimination ...
- maths - im trying to rearrange the following equation for x but getting confused...
- MATHS - i need a lil help with this If x=2 is a root of the equation 6x^3 - px^2...
- maths - 1x+2y=5 3x+7y=18 x= y= Multiply equation 1 by -3, add to equation 2 (...

More Related Questions