Wednesday

October 22, 2014

October 22, 2014

Posted by **Shawn** on Tuesday, August 14, 2007 at 6:54am.

Depends on the coefficients of the equation.

If in one of the equations I can solve for one of the variables without having to express it in fractions, I use substitution

3x + 7y = 9

4x + y = -3 ------> y = -4x-3, now sub that in the other equation

If not, I use elimination, that is, changing one or both of the equations to get a common coefficient for one of the variables, then subtracting or adding them to "eliminate" that variable.

2x+5y=6 ---times 3 -----> 6x+15y=18

3x-7y=1 ---times 2 -----> 6x-14y=2

now subtract them etc

**Answer this Question**

**Related Questions**

algebra - Explain the difference between solving a system of equations by the ...

algebra - Systems of equations can be solved by graphing or by using ...

Algebra - 40 =15 x x - 20 This is a three part question>> first find the ...

algebra - "Systems of equations can be solved by graphing or by using ...

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

Math - I am stuck on trying to figure out how to do this question. Could someone...

Math 116 - Consider the following system of equations. y=2x-2 y-2x=9 What can ...

algebra - Can someone help me figure this out please? when you solve a system of...

Math 1 - Consider the following system of equations. y = 4x - 4 y - 4x = 3 What...

Solving system of linear equations - I already know the 3 methods of doing it, ...