Maths ORD Level

James_LWAU · 10-06-2010 7:05pm #1

Can someone show me how to do a simultaneous equation?

Will the formula tables be the same as the ones I bought in the shop?

ajjmk · 10-06-2010 7:07pm

gimi an example & il use it to explain it to you

..if your tables are the browny ones then yes, if theyr the blue ones then therel be a few minor changes..

James_LWAU · 10-06-2010 7:10pm

Solve for x and y

x-y=1
x squared + y squares

Does anyone know what the percent rate for failure is for ORD maths:o

lucybrown · 10-06-2010 7:12pm

under 38%

Professional Griefer · 10-06-2010 7:12pm

James_LWAU wrote: »

Can someone show me how to do a simultaneous equation?

Will the formula tables be the same as the ones I bought in the shop?

say 2x + 4y = 20
x + 8y = 8

You multiply the bottom line by 2, so you can cancel the X's. Or you could do the Y's two. Make sure to change one of the lines, by multiplying by -1 if the numbers you're canceling are the same sign.

2x + 4y = 20
2x + 16y = 16

I'm gonna change the bottom line. so its now -2x -16y = -16

The 2's cancel, -12y = 4
-y = (1 over 3)
y = -(1 over 3)

Sub the Y value into one of the equations.
2x + 4(1 over 3) = 20
2x =18.6666
x = 9.3333

I'm sorry that was a horrible example. But hopefully you get the drift of what to do.

James_LWAU · 10-06-2010 7:13pm

Got 31 % in the pres but I didn't do the option question on paper 2 and didn't answer 2 of the calculus question so hoping to scrape a pass fingers crossed.

Do you get extra marks for neatness btw?;)

dyeti · 10-06-2010 7:14pm

James_LWAU wrote: »

Solve for x and y

x-y=1
x squared + y squares

Does anyone know what the percent rate for failure is for ORD maths:o

12% last time I read.

James_LWAU · 10-06-2010 7:15pm

Cheers buddy

lucybrown · 10-06-2010 7:15pm

i got 25% in mocks im so ****ed......i hate maths im so **** at it......i hope its easy

haha no u dont unfortunately!

and the pass rate certainly isnt 12%!!!!!!!

starryeyes122 · 10-06-2010 7:16pm

got 36% in the pre so im prayin to passs!!! 12% is pass rate??? lmao

Professional Griefer · 10-06-2010 7:17pm

James_LWAU wrote: »

Solve for x and y

x-y=1
x squared + y squares

Does anyone know what the percent rate for failure is for ORD maths:o

Oh this, my bad.

x = 1 + y
Put this into the equation with the squares.
(1 +y)^2 + y^2 = 0
1 + 2y + y^2 + y^2 = 0
2y^2 + 2y + 1 = 0
(y + 1)(y + 1) = 0
y = -1

x + (-1) = 0
x = 1

lucybrown · 10-06-2010 7:18pm

no unfortunately its not

ajjmk · 10-06-2010 7:19pm

James_LWAU wrote: »

Solve for x and y

x-y=1
x squared + y squares = 0

x - y = 1
x = y + 1

you plug that into
x squared + y squared = 0

it turns into
(y + 1)squared + y squared = 0

multiply out..
y squared + 2y + 1 + y squared = 0

tidy up
2y squared + 2y + 1 = 0

then work it out as a normal equation

find the roots, solve for y, plug your answers back into x = y + 1 to solve for x..

jumpguy · 10-06-2010 7:21pm

James_LWAU wrote: »

Can someone show me how to do a simultaneous equation?

Will the formula tables be the same as the ones I bought in the shop?

If you've the tables with the blue cover, then there are some very minor changes made, and errors corrected. Tbh, it's quite minor altogether and the changes can be found on www.examinations.ie .

The brown cover ones are exactly what you'll get in the exams.

10.3% of candidates failed pass maths last year (but 89.7% passed!

)