Maths, Addmaths and Statistics: Post your doubts here!

[Steel Arm]

Q. Which of the following equation is linear equation ?
A. 3 y=0
B -x2+3x + 10 + 0
C 2x + 3xy- 5y = 0
D x(x2-2x4) = 25x + x3 + 30

A

 

[sweetiepie]

Q. If the determinate of a matrix is zero, what does it tell ?
A That the matrix cannot be multiplied
B That the identity of that matrix does not exist
C That the ad joint of that matrix does not exist
D That the inverse of that matrix does not exist

 

[sweetiepie]

A

how? reason please

 

[Saad Mughal]

how? reason please

It is the only one that has 1 value of x for 1 value of y, in this case 3y=0, the gradient is 0, there y has one value only. It represents the X-AXIS, i.e y=0.

 

[Steel Arm]

how? reason please

well if u sketch it, its a horizontal line (in fact the x axis)
and if u wanna do by elimination
then all the other options have power of x greater than 1 therefore they are curves......

 

[sweetiepie]

It is the only one that has 1 value of x for 1 value of y, in this case 3y=0, the gradient is 0, there y has one value only. It represents the X-AXIS, i.e y=0.

well if u sketch it, its a horizontal line (in fact the x axis)
and if u wanna do by elimination
then all the other options have power of x greater than 1 therefore they are curves......

thank you

can i ask some more questions ?

 

[Saad Mughal]

Q. If the determinate of a matrix is zero, what does it tell ?
A That the matrix cannot be multiplied
B That the identity of that matrix does not exist
C That the ad joint of that matrix does not exist
D That the inverse of that matrix does not exist

The answer is D, since Adjoint/det. = Inverse of matrix, if det. = 0 then Inverse is undefined and hence does not exist.

 

[Steel Arm]

go head

thank you

can i ask some more questions ?

sure..ill help if i can

 

[Saad Mughal]

thank you

can i ask some more questions ?

Sure, but these are pretty basic questions, why are you asking us?

 

[sweetiepie]

If the 16% increase in the basic salary of a government employee will become Rs. 3248 per month . What is his salary before the increase?

 

[sweetiepie]

go head

sure..ill help if i can

thankz

Sure, but these are pretty basic questions, why are you asking us?

well my cuxn sis needs them

 

[Steel Arm]

If the 16% increase in the basic salary of a government employee will become Rs. 3248 per month . What is his salary before the increase?

Rs 2800
if 116% represents 3248
1% represents 3248/116
100% represents (3248/116) x 100 = 2800

 

[sweetiepie]

Q. Graph the linear function 3x + 2y = 0

 

[Saad Mughal]

Let x be original salary.
116/100 * x = 3248
x= 3248*100/116
x = Rs. 2800

 

[Steel Arm]

Q. Graph the linear function 3x + 2y = 0

how to show u tht one??? cant graph in replies
but just make a straight line passing through
(0,0) and (2,-3)

 

[Saad Mughal]

Again take the arbitrary values, x=-2, x=0, x=2, x=4.
Take a appropriate scale and draw and extend the straight line.

 

[Aiqbal]

use alternate logarithm method =D

 

[Aiqbal]

Q. Which of the following equation is linear equation ?
A. 3 y=0
B -x2+3x + 10 + 0
C 2x + 3xy- 5y = 0
D x(x2-2x4) = 25x + x3 + 30

B

 

[Suchal Riaz]

no the chapter of logarithmic and exponential functions itself
solving of exponential functions

when i started from past paper it was too difficult. i couldn't do ANY question from classified. i saw my teacher doing some questions which i asked him to solve and i got the common techniques to make the equations simple before solving. after few questions that topic has become easiest and my favourite chapter in whole syllabus.

 

[Suchal Riaz]

Q. Which of the following equation is linear equation ?
A. 3 y=0
B -x2+3x + 10 + 0
C 2x + 3xy- 5y = 0
D x(x2-2x4) = 25x + x3 + 30

a and c as maximum power of x and y is 1 in b there is x² term and in d x(x².... will turn it into x³ so it will be cubic not linear.