Posted by **T.T** on Thursday, January 24, 2008 at 10:16pm.

Solve the system by addition 2x-4y=7,4x+2y-1 can show one show me how to do this.

- Math -
**Jin**, Thursday, January 24, 2008 at 10:31pm
First, try to see if you can cancel out any of the variables by adding the equations.

4x+2y-1 also equals 4x+2y=1

(4x+2y=1)(2) = 8x+4y=2

now, add the two equations and see the y cancel out.

2x-4y=2

8x+4y=2

10x=4

x=4/10=2/5

Plug this number back into the equation (any of those two) and find y.

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