MATH SPECIMEN 4 HELP

[thukon]

QUESTION 9 c iii... How do u do it? the mark scheme doesnt explain  properly or i dont understand it. ill read all the posts so please dont rush at the cost of a proper explanation hoping that ur post is at the top. thanks.

[Ghost Of Highbury]

okk..
heres d answer
from the above 2 questions
u can conclude
that
4f + 2g = 32/3
f  +  g  = 10/3     -->> (*2)
------------------------
  2f   +  2g = 20/3
 -
  4f  +  2g  = 32/3
--------------------------
      -2f      =  -12/3 = -4
therefore f = 2

substite and find the value of g

[nid404]

 simultaneous equation.
f+g=10/3 X2----2f+2g=20/3
4f+2g=32/3

2f= 4 (32/3-20/3)
f=2

substitute value in equation to find g

f+g=10/3
2+g=10/3
g=10/3-2
g=1/1/3 or 4/3

hope its clear

[thukon]

ok thanks both of u. i used substitution method instead of elimination and that probably led to problems. its all clear now thanks.