Posted by **rany** on Thursday, March 19, 2009 at 1:41pm.

question: slove by comparison and check your solution?

a)2x-4y-5=0

3x+8y-4=0

my work so far:

2x-4y=5-------(1)

3x+8y=4-------(2)

_____________

6x-12y=15------(3) (3)-(4)

6x+16y=8-------(4)

____________________

28y/28 = 7/28

y= .25

2x-4(.25)=5

2x-1+5

2x/2 + 6/2

x = 3

ya i was wrong when i did my check, both sides werent equal, and i cant figure out why i was wrong in my work.PLEASE HELP!!!!!

- grade 9 math slope equations -
**bobpursley**, Thursday, March 19, 2009 at 3:02pm
you subtraced the equations wrong.

You should have gotten

6x-12y=15------(3) (3)-(4)

6x+16y=8-------(4)

____________________

-28y = 7

which leads to y=-1/4

- grade 9 math slope equations -
**rany**, Thursday, March 19, 2009 at 3:05pm
but i divided both sides by -28 though

- grade 9 math slope equations -
**rany**, Thursday, March 19, 2009 at 3:09pm
i did that and i got the same thing as before though?

- grade 9 math slope equations -
**Suck it**, Thursday, February 3, 2011 at 5:38pm
cool .....not

## Answer This Question

## Related Questions

- math 012 - will someone please double check my answer to this problem. the ...
- math - We consider the non-homogeneous problem {y''-16y} = {256x^{2}} First we ...
- grade 9 math slope equations - solve and comparison: a)4x-9y=4 6x+15y=-13 im so ...
- math - 1. Solve for the indicated letter D=4e, for e The solution is e= 2. G(x...
- math - how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where...
- math - how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where...
- algebra - What are the factors of the following trinomial? 16y^2 - 12y + 2 a) (...
- Math - PreCalc (12th Grade) - Which rectangular equation corresponds to these ...
- equations - Can anyone check this answer out for me... 2(5-6y) = 2 x 5 , 2 x -6...
- Math- Need Help - If 5x +4y and 4x +3y =5 15x +12y =18 16x +12y = 20 31x/31= 38/...

More Related Questions