Homework Help: math

Posted by shanquessa on Tuesday, November 4, 2008 at 1:18pm.

Hi, I am taking Algebra 2 and I need help with some Substitution method problems:

x+12y=68
x=8y-12

x+3y=7
2x-4y=24

3a+b=3
2a-5b=-15

-6=3x-6y
4x=4+5y

math - drwls, Tuesday, November 4, 2008 at 2:44pm
I'll do one for you. They all work the same way. You need the practice doing them yourself.

Substitute 8y - 12 for x in the first equation.
8y - 12 + 12y = 68
20 y = 80
y = 4
x = 8y - 12 = 32 - 12 = 20

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