anonymous
  • anonymous
3x-9y =81 2x-6y=-10 solve then classify the system
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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dumbcow
  • dumbcow
did you try elimination method or addition method
anonymous
  • anonymous
ive been working with the elimination method i wonder if the substitution method might work too but i havent gotten the right answer either way
dumbcow
  • dumbcow
either way will work for this problem i think elimination is easier lets cancel out the x's LCM of 2 and 3 is 6 multiply 1st row by -2 multiply 2nd row by 3 -6x +18y = -162 6x -18y = -30 ______________________ 0 + 0 = -192 0 = -192 this is False No solution

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dumbcow
  • dumbcow
system is inconsistent
anonymous
  • anonymous
if this occurs, then it's Undefined...
anonymous
  • anonymous
that means it would be dependent as well right?
anonymous
  • anonymous
x=dependent y=independent and since u don't know either one. "Undefined" then it can't be dependent or independent. unless i'm not seeing something here.
dumbcow
  • dumbcow
what do you mean undefined?? no not dependent, thats only if there are infinite solutions no solution means these 2 lines are parallel, same slope
anonymous
  • anonymous
Oh. True sorry i wasn't looking at it like this. Just haven't done this for a long time...
anonymous
  • anonymous
ok so it would be independent and inconsistent since both are parallel
dumbcow
  • dumbcow
correct
anonymous
  • anonymous
ok now the last part of the question to this one is to show it in graph form what would this problem look like graphed
dumbcow
  • dumbcow
where do you think you were messing up?
dumbcow
  • dumbcow
graph both lines either by putting them in y=mx+b form or make a table of x,y values and connect the points
anonymous
  • anonymous
whats bad is im trying to learn algebra in a 9 week period and ive never done it in my life back in high school we had the whole yr to learn this
dumbcow
  • dumbcow
oh online class ? yeah that can be hard
anonymous
  • anonymous
it is very frustrating
anonymous
  • anonymous
so y=(81-3x)/-9 and y=(-10-2x)/-6
anonymous
  • anonymous
I've taken online math before. But it's always gave me an option to view and example of the problem how to solve. It's harder for u...
anonymous
  • anonymous
im posting problems i have trouble with and am hoping to see them worked out with the answer so i can see how they are done but many just give me the answer which is not helping
anonymous
  • anonymous
the graphing problems are hardest becaise noone really can show me what they look like
anonymous
  • anonymous
have you herd of Graphing Calculators? Texas Instruments...
dumbcow
  • dumbcow
@beehive yeah those examples can be really helpful but they dont answer everyones questions and you dont know why you do the steps it shows you to do
dumbcow
  • dumbcow
graphcalc.com free graphing software
anonymous
  • anonymous
ill chk it out im gonna post a few more and head to bed my head istarting to hurt lol

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