Thursday

November 27, 2014

November 27, 2014

Posted by **Mathew** on Thursday, January 13, 2011 at 8:17pm.

7x - 2y =3

2x +y = 4

?????????????????

- MATHH -
**helper**, Thursday, January 13, 2011 at 9:30pm(1) 7x - 2y =3

(2) 2x + y = 4

look to see which variable is easier to get rid of. since the first equation has -2y, multiple the 2nd equation by 2, so that you get 2y. -2y + 2y = 0, so you will have eliminated the y variable

Multiple (2) by 2

2 (2x + y = 4) = 4x + 2y = 8

Add the two equations together

7x - 2y = 3

4x + 2y = 8

11x + 0 = 11

11x = 11

x = 1

Substitute x = 1 in either equation (1) or (2) to find y.

7x - 2y = 3

7(1) - 2y = 3

7 - 2y = 3

2y = 4

y = 2

To check

substitute x = 1, y = 2

in the other equation (1)

2x + y = 4

2(1) + 2 = 4

2 + 2 = 4

4 = 4

so it's correct

- MATHH -
**Mathew**, Thursday, January 13, 2011 at 9:40pmThanks a lot:D

- MATHH -
**helper**, Thursday, January 13, 2011 at 9:52pmyou're welcome

**Answer this Question**

**Related Questions**

algebra - I just need a quick check before I hand in my work if you would......

algebra URGENT! - Solve the system using elimination. 2x – 2y = –8 x + 2y = –1 ...

College Algebra - Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above ...

Math - Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of ...

algebra - I have a few problems I need you to take a look at and tell me if I ...

Algebra - I have a few problems I need you to take a look at and tell me if I ...

Math/Check - I have a few problems I need you to take a look at and tell me if ...

Algebra/math - I have a few problems I need you to take a look at and tell me ...

Algebra/no response yesterday - I have a few problems I need you to take a look ...

math - can someone please help me with this elimination methods problem? 0.05x+0...