i need help with this problem

[ilianaaloha]

it is a linear equation. i need to solve it using the addition method could someone please help me with the steps to how to do this?


it is:

-X+Y=2
X+Y=4

 

[ochocki]

-X+Y=2
X+Y=4

Since the x variables cancel out just solve for y as 2y=6.

Then input the y value back into the original equation to obtain the value for x.

 

[ilianaaloha]

but thats the substitution method i need to use the addition method

 

[ochocki]

by addition method could they mean that you have to add each equation to eliminate variables? I don't really see any other way of solving other than that.

 

[skeeter]

but thats the substitution method i need to use the addition method

the addition method is exactly what ochocki did.

add 'em up ...

-x + y =2
x +y = 4
-----------
0+2y = 6