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

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