Three pre-college algebra questions i can't seem to get?

  • Thread starter Thread starter dreamreaper20
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dreamreaper20

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For the first question, I am supposed to use the substitution method to solve a system set:
1.) 3x+y=7
y=-3x-2

For the next two questions I am supposed to use the elimination method to solve these solution sets:
2.) 1/4x+1/3y=-1/12
1/2x-5/4y=7/4

3.) 4x-8y=36
3x-6y=27

Any tips on how to get to the correct answers? I'm at a loss...
Please and thank you! <3
 
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