.9x - .6y = 12
.4x + .6y = 10/23
Add the two.
1.3x = 12 10/23
You should be able to work it from here.
solving using the elimination method
0.3x-0.2y=4
0.2x+0.3y=5/23
1 answer
0.3x-0.2y=4
0.2x+0.3y=5/23
1 answer