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To do a substitution problem you must have at least two equations and with an 'X" and a "Y" in both equations. you have to get one of the equatons to where it equals X or Y. then substitute in it for that variable in the other equation. Here is an example: |
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3(3Y+10)+2Y=8 9Y+30+2Y=8
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I
have the two equations and I substituted It in for the X.
I did the math and distributed the 3 o the number in the parentheses. The rest is just simple math. |