Posted by **hannia** on Monday, April 18, 2011 at 7:23pm.

hello i need help with system of equations theres 3 only thank you

2x+3y-17

3x+y=31

2(x-3y)=24

y=3x-2

2(x+4)=24

x+y=17

- need alot of help please math -
**Damon**, Monday, April 18, 2011 at 8:35pm
2x+3y=17 I assume

3x+y=31

try elimination

multiply the entire first equation by 3 to get 6x term

multiply the entire second equation by 2 to get 6x term

so:

6x+9y = 51

6x+2y = 62

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

7 y = -11

y = -11/7

then 2x = 17+33/7

x = 152/14 = 76/7

check

3(76/7) -11/7 = 31, right

- need alot of help please math -
**Damon**, Monday, April 18, 2011 at 8:38pm
for the second one you already have y as a function of x so use substitution

2(x-3y)=24 ---> x - 3y = 12

y=(3x-2 )

x - 3(3x-2) = 12

-8 x + 6 = 12

-8 x = 6

x = -3/4 etc

- need alot of help please math -
**Anonymous**, Wednesday, April 20, 2011 at 3:49pm
are you sure whatb grade are you in

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