Wednesday

July 23, 2014

July 23, 2014

Posted by **deedee** on Tuesday, January 6, 2009 at 2:23pm.

Solve using substitution method

1. 3x+2y=12

x=52-6y

answer:-40.8 I am pretty sure that one is wrong.

Solve using elimination method

2. 2r-7s=-31

7r+2s=24

answer: (230/53,-468/53)

3.3x+4y=3

6x+8y=6

answer: No answer. problems eliminate eachother

- math -
**Damon**, Tuesday, January 6, 2009 at 2:26pm3(52-6y) + 2 y = 12

156 - 18 y + 2 y = 12

-16 y = -144

y = 9

x = 52 - 6(9) = 52 - 54 = -2

- math -
**deedee**, Tuesday, January 6, 2009 at 2:39pmThank you Damon!

Can you help me with the formula to solve by elimination?

- math -
**Damon**, Tuesday, January 6, 2009 at 2:44pm3x+2y=12

x=52-6y multiply everything by 3 on this line

3x+2y=12

3 x = 156 - 18y

---------------- subtract

0 x + 2y = 12 -156 + 18 y

0 = - -144 + 16 y

y = 144/16 = 9 again

- math -
**Anonymous**, Sunday, May 16, 2010 at 10:29pm2r-7s=0

7r+2s=53

- math -
**mani**, Tuesday, December 21, 2010 at 8:58pm6,174,000,000

**Related Questions**

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

Linear Equations - Can you please help solve this equation using the ...

Substitution Method-Plz help - Use the Substitution method to solve the system ...

math - Solve by elimination method. 2r-5s=-33 5r+2s=48 Solve by substitution ...

math - Solve by elimination method. 2r-5s=-33 5r+2s=48 Solve by substitution ...

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

algebra - Solve by elimination method. 2r-5s=-33 5r+2s=48 Solve by substitution ...

Math - How do I solve these problems, I really need help. Solve by substitution ...

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

MATH - SYSTEMS OF EQUATIONS CAN BE SOLVED BY GRAPHING OR BY USING SUBSTITUTION ...