TYS 'O' LVL maths question

• tinuviel07

  9 Oct 08, 17:18

  how can be as pro as eagle

• eagle

  9 Oct 08, 17:19

  I returned all my chemistry to teacher liao

   

• tinuviel07

  9 Oct 08, 17:20

  haha i returned my physics.. im forced to study chem for tuition..

• eagle

  9 Oct 08, 17:21

  I will be re-reading JC physics to teach also :D

   

  By the way, tinuviel, help spread ExamWorld to your students as well :D
  Let as many pple know as possible

• tinuviel07

  9 Oct 08, 17:24

  haha alright.. but my students are mostly so not hardworking one

• gunner77

  9 Oct 08, 17:25

  wah today i haven start my revision....

  deep shit

• eagle

  9 Oct 08, 17:25

  nvm

  when they really kan cheong, then they will be hardworking

• eagle

  9 Oct 08, 17:26

  Originally posted by gunner77:

  wah today i haven start my revision....

  deep shit

  Start with ExamWorld

  Heh heh... Quite a bit of E maths, A maths and O lvl physics questions liao..

• gunner77

  9 Oct 08, 17:27

  i noe i checked out the website liao

  rite now, im waiting to finish my TYS, then i go there do those question

• eagle

  9 Oct 08, 17:28

  hmmm... actually do try to finish your TYS first... more important...

  help me spread the website to your peers and juniors hor...

• gunner77

  9 Oct 08, 17:30

  ok np

• gunner77

  13 Oct 08, 00:01

  TIN TIN~

  help me with these 2 question please.

  22a) factorise (a-2b)-3c(a-2b)

  22c) simultaneous equation

         2x-3y=15

         3x-7y =27.5

• gunner77

  13 Oct 08, 00:02

  answer are

  22a) (a-2b)(1-3c)

  22c) x = 4.5

          y = -2

• Ahm97sic

  13 Oct 08, 00:30

  Hi gunner77,

  (22)(a)    (a-2b)-3c(a-2b)

              =1(a-2b)-3c(a-2b)

              = (a-2b)(1-3c)

  22(c)    2x-3y=15  -------------- (1)

         3x-7y =27.5   -------------- (2)

  Eqn (1) x 3

              6x - 9y = 45 ----------- (3)

  Eqn (2) x 2

              6x - 14 y = 55 --------- (4)

  Eqn (3) - Eqn (4)

                       5y = - 10

                         y = - 2

  Subst y = -2 into eqn (1)

           2x - 3(-2) = 15

           2x + 6      = 15

           2x            = 9

             x            = 4.5

  Tin Tin is probably not free today. I will help you with the answers today. Tomorrow, tin tin will continue to help you lah.

  Thank you for your kind attention.

  Regards,

  ahm97sic

• gunner77

  13 Oct 08, 00:35

  Originally posted by Ahm97sic:

  Hi gunner77,

  (22)(a)    (a-2b)-3c(a-2b)

              =1(a-2b)-3c(a-2b)

              = (a-2b)(1-3c)

  22(c)    2x-3y=15  -------------- (1)

         3x-7y =27.5   -------------- (2)

  Eqn (1) x 3

              6x - 9y = 45 ----------- (3)

  Eqn (2) x 2

              6x - 14 y = 55 --------- (4)

  Eqn (3) - Eqn (4)

                       5y = - 10

                         y = - 2

  Subst y = -2 into eqn (1)

           2x - 3(-2) = 15

           2x + 6      = 15

           2x            = 9

             x            = 4.5

  Tin Tin is probably not free today. I will help you with the answers today. Tomorrow, tin tin will continue to help you lah.

  Thank you for your kind attention.

  Regards,

  ahm97sic

  
  hey ahm97sic THANKS ALOT MAN

  it seems so easy now, i really did not tink of the 1 for part A.

  as for part C, i did change both equation into 6x

  i still couldn't get the answer. guess it must be the long working tat cause me to be careless.

  anyway thanks ahm97sic! really thanks alot.

• gunner77

  13 Oct 08, 00:37

  edited.

• Ahm97sic

  13 Oct 08, 00:50

  Hi Gunner77,

  You are welcome.

  I have observed that you are busy preparing for your coming exam.  Keep practising and revising and if you have any doubts, queries, please come to the forum to ask. There will be many people in the forums to help you in all your subjects. There are forumers who are the writers of the solutions to the ten years series, teachers, tutors, past students, current students and others to help you in your studies.

  Thank you for your kind attention.

  Regards,

  ahm97sic

• tinuviel07

  13 Oct 08, 22:17

  lol sorry nv check thread

• gunner77

  13 Oct 08, 22:21

  tin tin !

  now i got a few questions

• gunner77

  13 Oct 08, 22:23

  (a) solve the equation (2a-3)^2 = 16

  (b) y is directly proportional to x^2

        x is increase by 100%

        find the percentage increase in y

• gunner77

  13 Oct 08, 22:25

  answer are

  15(a) a = 3.5 or -0.5

       (b) 400%

• lpx88

  13 Oct 08, 22:29

  Originally posted by gunner77:

  (a) solve the equation (2a-3)^2 = 16

  (b) y is directly proportional to x^2

        x is increase by 100%

        find the percentage increase in y

  a) Square root both sides

  2a-3=4

  2a=3=4=7

  a=7/2=3.5

  b)y=X^2

  let X be 1

  When X=1, Y =1

  Let X be 2( Since increase by 100% as stated)

  Y=2^2=4

  4/1 X 100% =400%

   

  Edit: Sorry for Part A i forgot got 2 answers

   

  coz when u square root 16 u get -4 or 4

  so when 2a -3=- 4, 2a=-1, a = -0.5

  u sure is -1.5?

• tinuviel07

  13 Oct 08, 22:30

  lol got alot of ppl help me ans liao.. no need me

• gunner77

  13 Oct 08, 22:31

  Originally posted by lpx88:

  a) Square root both sides

  2a-3=4

  2a=3=4=7

  a=7/2=3.5

  b)y=X^2

  let X be 1

  When X=1, Y =1

  Let X be 2( Since increase by 100% as stated)

  Y=2^2=4

  4/1 X 100% =400%

  wah dont understand..........

• eagle

  13 Oct 08, 22:32

  this thread very good for me to put on examworld :D

  but I haven't put yet... these few days concentrating on increasing physics questions

  photoshop to create pictures damn fun... This one nice hor: