Sunday

December 21, 2014

December 21, 2014

Posted by **Amanda** on Monday, February 18, 2008 at 9:52pm.

Help please. The only reasons I can think of is because in substitution it might be more difficult cause there's a possibility of working with fractions.

- Math -
**Reiny**, Monday, February 18, 2008 at 10:03pmActually, that is the best reason.

I use the following criterium.

If I see one of the variables having a coefficient of 1 OR -1, I solve for that variable and use substitution, resulting in no fractions, unless the equation contains fractions to begin with.

As a matter of fact if I see fractions in either one of my equations, I usually multiply each term by the LCD of the fractions, thereby eliminating the fractions.

g. 4x+5y = 12

3x-y = 9

I would solve for y in the second, then sub that into the first.

Of course if the answer itself is a fraction you would be stuck with thAT.

**Answer this Question**

**Related Questions**

Algebra - Solving system of linear equations by using the apropiate method name ...

MATH - Solving by graphing DQ 1 Solving by substitution Solving by elimination ...

Algebra - Explain why the addition method might be preferred over the ...

math - List advantages and disadvantages comparing and contrasting solving ...

MATH - Useing substitution/elimination method what is the solution set to 2x+y=1...

algebra - Explain why the addition method might be preformed over the ...

Algebra - Explain why the addition method might be preferred over the ...

Business Algebra - Produce an example of a system of equations to your fellow ...

math - Solve the system of equations by Elimination OR Substitution. Explain why...

Math: Algebra - 1. Which method would be the simplest way to solve the system? ...