Question 644307
Hello, 
I'll do  the first one, let's see if you can do the rest of them. 
4x+3y=11
x=3y-1 
Substitute the second equation into the first like this:
4(3y-1)+3y=11
Expand:
12y-4+3y=11
Add 4 and combine:
15y=15
Divide by 15:
y=1
Plug this into either equation to find x:
x=2
Make sense?
RJ
www.math-unlock.com