algebra
posted by sharday on .
Solve using the substitution method 6x3y=18, 6x+3y=12

Substitution:
Rewrite each as:
6x=3y+18
6x=123y
Since they are both 6x, then
3y+18=123y
=>
6y=30
y=5
and
x=(3*(5)+18)/6=1/2
By elimination (easier in this case)
Add the two equations:
6x3y + 6x+3y = 18 12
12x=6
x=1/2
3y=186*(1/2)
y=5