Ok I'm looking over a lesson for algebra and I really don't get how this answer works. What I have to do is multiply two equations to find the interception in the graph. But this makes no sence at all.
The question was:
4x - 3y = 1
x - 4y = 6
I multiplied the top equation by 1 and the bottom one by -4, and I came out with this:
4x - 3y = 1
-4x + 16y = -24
Ok the 4x cancels each other out. I add the top two equasions and end up with
13y = -23
y = -23/13
Hmm ok, now I need to find X... I take the bottom equasion and plug in the y value.
x - 4y = 6
x - 4(-23/13) = 6
x + 92/13 = 6
-92/13 -92/13
But now what? How do you subtract -92/13 from 6? I looked in the answers and its -14/13. How the hell did they get -14? Am I missing somthing?
2007-05-03 19:11:33 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Ah, Ok I see what you mean. Thanks =D
2007-05-03 19:22:23 · update #1
6 is same with 78/13. Now you can do 78/13 - 92/13.
[ 6/1 - 92/13 = (combining denominators)= (6*13 - 92*1)/(1*13) = -14/13 ]
2007-05-03 19:51:51 · answer #1 · answered by saghar_s11 1 · 0⤊ 0⤋
All you do is you have to put the six over 13 so you multiply 6x13 and it comes out to be 78/13. Then you subtract 92/13 and you come up with -14/13.
2007-05-04 02:16:39 · answer #2 · answered by Anonymous · 0⤊ 0⤋
take the LCM for -92 and 6
u'll get it right , i suppose
2007-05-04 02:59:25 · answer #3 · answered by vaish_srimag 1 · 0⤊ 0⤋
4x-3y=1
x-4y=6
x=4y+6
4(4y+6)-3y=1
16y+24-3y=1
13y+24=1
13y+24-24=1-24
13y=-23
y=-23/13
x-4(-23/13)=6
x+92/13=78/13
x+92/13-92/13=78/13-92/13
x=-14/13
2007-05-04 02:41:01 · answer #4 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋