Wednesday

October 22, 2014

October 22, 2014

Posted by **Linda** on Thursday, August 27, 2009 at 12:56am.

2.Given that: 4x-y+9=0 and 3y-2x=7, solve for x.

- Math -
**Jordan**, Thursday, August 27, 2009 at 5:06amI'll answer 2.

to get rid of the y's we make this a simultaneous equation

(1)4x-y=-9

(2)3Y-2X=7

the number of y's must be equal so that they will cancel eachother out when we add them together

so 3*(1)=12x-3y=-27

then we do (1)+(2)

12x-3y+3y-2x=-27+7

hopefully you will see that the y's cancel eachother out and we are left with

10x=-20

therefor x=-2

if you are unsure with any of the steps feel free to ask :)

**Answer this Question**

**Related Questions**

Math - Sally's age is 12 years plus half her age. How old is she? Billy is twice...

Math problem solvimg - Sally's grandfather is 67 tears old. Sally is 19 years ...

MATH - SALLYS AGE IS 12 YEARS PLUS HALF HER AGE. HOW OLD IS SHE?

math - A. A woman was 30 years old when her daughter was born.Her age is now 6 ...

Algebra - One half of Heather's age two years from now plus one third of her age...

math - 1. Lisa is 15 years old and her father is 40. How many years ago was the ...

Algebra (Age Problem) - Five years ago Rico's age was half of the age he will be...

Algebra - Mario is 16 years older than his sister Mercedes. Together, their ages...

math - how do i do this math problem ? what is my age ? add my age , plus half ...

math - john is the age that sally was 3 years ago,13 year old elissa is 3 years ...