Question

hey guys can sum1 please help me anwser this question thanks..calculate the y intercept (b) of a line that is perpendicular to the line y=8x+3 and that gose threw the point (-1,-3)

Answer 1

Gradient of perpendicular line is -1/8. So y=-x/8+c, so -3=1/8+c, so c=-25/8

Answer 2

i appreciate the reply
so my anwser would be c=25/8??

Answer 3

-25/8

Answer 4

sry -25/8?

Answer 5

Yep.

Answer 6

u r the best i really hope this is correct

Answer 7

do you kind helping me with another 1 or 2?

Answer 8

Yeah, ok then.

Answer 9

calculate the slope of the line that these two points lie on (-5,0) (1,-5)

Answer 10

how would -25/8 be graphed though?

Answer 11

\[m=\frac{\Delta y}{\Delta x}=\frac{y _{2}-y _{1}}{x _{2}-x _{1}}=\frac{-5}{6}\]

Answer 12

What do you mean how would it be graphed?

Answer 13

slope = (y2-y1)/(x1 - x2) = (-5-0)/[1-(-5)] = -5/6

Answer 14

i dont even know im just really confused lol .. -25/8 is the y intersect?

Answer 15

ty karkirat

Answer 16

Yes which is -(3 & a eighth) if that helps.

Answer 17

harkirat *

Answer 18

u r welcome

Answer 19

would u guys be able 2 help me with a matrix problem?

Answer 20

if a = b=
-3 -5 5 2
8 -2 -3 1
then what is the element in the first row first colum of the matrix X if; B+ (1/3)X=2A

Answer 21

i just dont understand what x is coming from wat is x

Answer 22

X is defined by the equation B_(1/3)X=2A.

Answer 23

the dterminant if a is 46 d of b is 11

Answer 24

so x would have to be 243

Answer 25

but how do make x a matric in order to get the 1st row 1st colum element

Answer 26

Ok, think about it like this: the top left element of 2A is -6, you need some number that when you divide it by 3 and add it to 5, you get -6. So the top left element of X is -33.

Answer 27

would there be a way to solve that if i just havbe the determinant for matrix x?

Answer 28

also i am submitting these anwsers online so in the anwser box for the previous 2 questions is i woulkd write
-25/8
-5/6 would that be correct or it should be like (-5,6)

Answer 29

-25/8 & -5/6

Answer 30

You don't need to know the determinant of X because you know A & B.

Answer 31

hey buddy r u still there?

Answer 32

Yep.

Answer 33

sry but do u mind helping me out again wat just happened to me is unbelievable
i took a test online took me 4 hrs to complete and it did not go threw and i have a completly new 1 with differnt question

Answer 34

Calculate the y-intercept (b) of a line that is perpendicular to the line y=2x+2 and that goes through the point (-3,4).

Answer 35

Ok, how about I show you how to do these and you can work them out for yourself?

Answer 36

can u prety please just help me out with like 3 i will do the rest i spent 4 hrs on the other test and have 2 solve many of these as well and have not even slept yet and have class

Answer 37

Yeah, sure, I was just thinking it might be better for you if I show you the method rather than just doing each question :)

Answer 38

please man i know thats the right thing but this is unbelievable i cant believe im still doing math at 8 am i have not slept

Answer 39

Wow is it 8 o'clock there?! It's 1 in the afternoon here :P

Answer 40

Ok, m=-1/2, so y=-x/2+c, so 4=3/2+c, so c=2.5.

Answer 41

so the anwser for y intercept is 2.5?

Answer 42

If

-4 -8

A = 6 6

and

5 2

B = -3 1

then what is the element in the first row and first column of the matrix X if: B + (1/3)X = 2A

Answer 43

Yep :)

Answer 44

-54

Answer 45

thanks now that matrix question plz

Answer 46

No wait, that's not right. It's -36.

Answer 47

take ur time buddy lol

Answer 48

Sorry, -39, definitely -39.

Answer 49

r u sure

Answer 50

Yeah.

Answer 51

By using Gauss Jordan Elimination find what z is equal to from the following set of three equations:

x - y + 3z = 14

x + y + z = 6

-2x - y +z = 0

Answer 52

Isn't Gauss-Jordan Elimination to do with matrices?

Answer 53

yes

Answer 54

thats wat we have been doing no? lol

Answer 55

I don't know what that has to do with it but z=4.

Answer 56

lol
ok

Answer 57

im done do u mind if i just give my anwsers so u can see if they r correct

Answer 58

No problem, go for it.

Answer 59

Find what y is equal to in the following system of equations by whichever method you prefer. 1x+4y=5 -3x+8y=1
Answer .8

Answer 60

If

5 1

A = 8 -5

and

5 2

B = -3 -1

then what is the element in the second row and first column of the matrix that results from mulitplying matrix A times matrix B ?

Answer 55

Answer 61

If

-4 -8

A = 6 6

and

5 2

B = -3 1

then what is the element in the first row and first column of the matrix X if: B + (1/3)X = 2A

-39

Answer 62

I make the first one -3.

Answer 63

Find what y is equal to in the following system of equations by whichever method you prefer. 7x+-4y=4 3x+-3y=4
1.777

Answer 64

Find the distance between the following two points: (-6,5) and (5,-3)

13.601

Answer 65

If

2 -4

A = -3 -6

and

5 2

B = -3 1

then what is the element in the second row and second column of the matrix that results from subtracting matrix A from matrix B ?

-7

Answer 66

and thats itthanks man let me know wat u think

Answer 67

In the system of equations i make it -16/9=-1.7777...

Answer 68

Distance between points is correct.

Answer 69

The matrix subtraction is 7.

Answer 70

y r we gettin differnt signs for everything

Answer 71

I don't know but that matrix one is definitely 7: 1-(-6)=7

Answer 72

im using an online calculator
it says -7cause its -6-1 not 1--6

Answer 73

Subtracting A from B is B-A not A-B.