Wednesday

January 28, 2015

January 28, 2015

Posted by **Andraline** on Sunday, January 16, 2011 at 10:58pm.

4x-3y = -19

6x=12/6

x = -2

this is elimination method. i have few questions, when do we know wen to add or subtract? multiply? how? i dont know nothing.

- MATH!!!!!HELP -
**bobpursley**, Sunday, January 16, 2011 at 11:11pmThe idea is to eliminate a variable. YOu add or subtract to do that.

x-y=4

x+y=6 on that add, the y will be elimated.

2x-y=4

5x-y=5

on this, subtract because the signs are the same, they do not add to zero.

it becomes

2x-y=4

-5x+y=-5

then you get -3x=-1..

Now multiplying

2x+3y=7

3x+y=5

if you want to eliminate the y, then multiply the second equation by 3, then subtract. If you want to eliminate the x, then multiply the top equation by 3, and the second equation by 2, then..subtract, and x will go away.

**Answer this Question**

**Related Questions**

Math, Please Help! - Ned divided a given number by 3 and then added 2. If he ...

need guidance on an algebra problem - 20 x+3(y-1)=11 2(x-y)+8y = 28 multiply ...

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

Algebra - How do I solve for elimination method on this problem: 0.3x - 0.2y=4 ...

Math - Can you check these questions for me? 1. Add: (3x^4-x+2)+(9x^5-x^2+x) 9x^...

3rd math - The commutative, or order, property applies to which operations? A. ...

math elimination method - elimination method really confuses me. solve by ...

Math - If you multiply a number by 3 and then add 40, the result is the same as ...

math - Name: Barbara Dillon Date: July 18 2010 1. Divide 90÷18 =5 Answer is 5 2...

math - Jen, I will attempt to write the others out. #3)ADD: -57 + (-22) I got -...