Posted by **jririfi** on Sunday, July 20, 2014 at 3:04pm.

So I've been working on solving this system by addition/subtraction and I just can't get the right answer. Her is the system of equations I was given to solve by add/sub:

3x – y = –12

x + 2y = –18

- Math -
**Reiny**, Sunday, July 20, 2014 at 3:22pm
double the first:

6x - 2y = -24

x + 2y = -18

add them:

7x = -42

x = -6

back into the second:

-6 + 2y = -18

2y = -12

y = -6

x = -6 , y = -6

- Math -
**Anonymous**, Saturday, October 29, 2016 at 6:58pm
solve the system by substitution

6x+2y=-18

-x+5y=19

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