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