Originally Posted by
IAmLegendToo Not 100% sure here, but.
To solve for y.
Rewrite 128 as 2 to the something power, which is:
2 to the 7th power.
Set x+3y equal to 7.
x+3y = 7
3y = -x + 7
y = -(x-7)/3
Same for x, except solve x+3y = 7 for x.
x = -3y + 7
I believe this is how it's done.