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

Can someone please check my work?

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 2:26pm
3(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 2:39pm
Thank you Damon!

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

- math -
**Damon**, Tuesday, January 6, 2009 at 2:44pm
3x+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 10:29pm
2r-7s=0

7r+2s=53

- math -
**mani**, Tuesday, December 21, 2010 at 8:58pm
6,174,000,000

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