Thursday

August 28, 2014

August 28, 2014

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

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

x+y=5

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 12:19pmMultiplying 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! :-)

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