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January 31, 2015

January 31, 2015

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

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 2:44pmI'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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