anonymous
  • anonymous
3x-7y=21. Need the 3 ordered pairs where #1: x=0, is __ #2: y=0, is __ #3: y=-6, is __.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
ok, so for the first one, you would plug in 0( which is x) in the equation.: 3(0)-7y=21 0-7y=21 y=21/-7 y=-3, so first ordered pair would be (0, -7) for the second one you would plug in0 for y this time, and in the third one you would plug in -6 for why, and solve for x on that too. then you have your three ordered pairs
anonymous
  • anonymous
I am still not getting it so need more help
anonymous
  • anonymous
ok, so lets do the second one

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anonymous
  • anonymous
ok i tried but got lost
anonymous
  • anonymous
the second one says y= 0 so we are going to plug in 0 for the y, in the function: 3x-7y=21 so when we plug in 0 for y, the function now says: 3x-7(0)=21 next we multiply 0 times 7, so we get: 3x-0=21, which is basically 3x=21 next, we finaly divide 3 on both sides to get x by itself x=21/3 which is x =7
anonymous
  • anonymous
so now that we know that x=7 , when y=0, the ordered pair is in the form of (x,y) which in this case, it would be (7, 0). that is your second set of points. did you understand this?
anonymous
  • anonymous
well when i did it it was a little different but it did not look right but had the same answer
anonymous
  • anonymous
for the last one i started with 3x-7(-6)=21
anonymous
  • anonymous
then i had 3x-42=21
anonymous
  • anonymous
ok wait a sec
anonymous
  • anonymous
whats -7 *-6?
anonymous
  • anonymous
don't I replace the y with -6?
anonymous
  • anonymous
yes, but what is -7 times -6. can you hold up for a sec
anonymous
  • anonymous
sure
anonymous
  • anonymous
3x-7(-6)=21 is the correct next step, but what do you get when you multiply negative 7 times negative 6?
anonymous
  • anonymous
you get positive 42
anonymous
  • anonymous
so you should have 3x-42=21
anonymous
  • anonymous
no, its going to be 3x+42=21 because we got positive 42, not negative 42
anonymous
  • anonymous
ok i see
anonymous
  • anonymous
yes 3x+42=21, what do we do next?
anonymous
  • anonymous
get x by itself by using 3
anonymous
  • anonymous
OK WAIT
anonymous
  • anonymous
we still have that 42 there, and we need to get rid of it, so how do we get rid of that 42: 3x+42=21
anonymous
  • anonymous
3x +42 -42 = 21 +42 - 42
anonymous
  • anonymous
there we go! and what do we get?
anonymous
  • anonymous
3x=21
anonymous
  • anonymous
wait whats 21-42? -21!
anonymous
  • anonymous
huh?
anonymous
  • anonymous
I thought the 42s cancelled each other out
anonymous
  • anonymous
yes, but its not 3x=21 its 3x=-21
anonymous
  • anonymous
ok I don't get it
anonymous
  • anonymous
so this is what you got 3x +42 -42 = 21 +42 - 42
anonymous
  • anonymous
right
anonymous
  • anonymous
why did you add 42 both sides? you were only supposed to subtract 42 on both sides. try it again,
anonymous
  • anonymous
3x +42 -42 = 21- 42 is what you should get
anonymous
  • anonymous
ok i put an extra one in there
anonymous
  • anonymous
exactly so figure it from this: 3x +42 -42 = 21- 42
anonymous
  • anonymous
ok so 3x +42 -42 = 0
anonymous
  • anonymous
21 -42= -21
anonymous
  • anonymous
yes so it should be 3x=-21
anonymous
  • anonymous
so (-21,-6) is the ordered pair
anonymous
  • anonymous
we stil need to find x! we were left with 3x=-21 ! remember we need to get x by itself!
anonymous
  • anonymous
ok so we us 3 on both sides
anonymous
  • anonymous
we divide 3 by both sides
anonymous
  • anonymous
damn this thing hangs up on me a lot. so we should end up with x = 21
anonymous
  • anonymous
whats -21/3?
anonymous
  • anonymous
-7
anonymous
  • anonymous
so x=-7. gosh, what grade are you in? and math level?
anonymous
  • anonymous
I just started college last year Oct and I graduated in 1969 and had just basic math. I was able to transfer 52 credits from my military career. So I am about a late sophmore or early junior. math is 092 which is pre algebra
anonymous
  • anonymous
college 0.0i learned this in 6th and 7th.
anonymous
  • anonymous
ya I know but I have never had algebra before
anonymous
  • anonymous
and im in 9th. yaaay! i feel so smart!
anonymous
  • anonymous
when i was in high school we did not have algebra and geometry. it did not exist
anonymous
  • anonymous
so when i was in 12th they were just starting it as an elective.
anonymous
  • anonymous
I guess that is why it is so hard for me.
anonymous
  • anonymous
whoa! it really does amaze me how far human intelligence has gone. I cant imagine how advanced our human race will be in he next 40 years
anonymous
  • anonymous
ya i know. i wish there was a way for me to shock the heck out my brain so it would be easier for me to learn
anonymous
  • anonymous
lol, so do i! agh sooo much work!
anonymous
  • anonymous
ya but you understand this. I son't understand any of it. I just started in Jan to learn this junk
anonymous
  • anonymous
ya, this si easy. but im doing precal, and ap microecon, and ap Human Geogarohy, and ap bio

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