Posted by **Daisy** on Monday, January 25, 2010 at 7:51pm.

I'm really confused on substitution. My teacher has a terrible accent and cannot understand what she says. i get the basics myself but i'm pretty confused on the following problems:

1) y= 3x - 8

y= 4-x

2) 2x + 7y = 3

x=1- 4y

3) x = 2y

4x + 2y = 15

Any help. I know i should probably know this by now. i started mid term :/

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