Question

HELP!!!

Answer 1

@Agl202

Answer 2

@Michele_Laino

Answer 3

for lines to be perpendicular their GRADIENTS have to satisfy the equation
gradient of line 1 * gradient of line 2 = -1
Now work it out.

Answer 4

Perpendicular: negative reciprocal slopes

Answer 5

i dont know what any of that means lol

Answer 6

Example: if the slope of 1 line 2, then the slope of the line perpendicular has to be \(-\dfrac{1}{2}\)

Answer 7

for lines to be perpendicular their GRADIENTS have to satisfy the equation
gradient of line 1 * gradient of line 2 = -1
Now work it out.

Do you get this?

Answer 8

no

Answer 9

okay do you know what are the gradients of the line given

Answer 10

I dont know what gradients are

Answer 11

the coefficients with x

Answer 12

is the answer A?

Answer 13

now dont just start guessing answers

Answer 14

do you understand what a gradient is a straight line equation

Answer 15

well half of 8 is 4 and you can add 4 to 1 and get 5 so A makes sense

Answer 16

Yeah the numbers with x

Answer 17

no A is not correct

Answer 18

let me just show why A is not correct
Okay for A the equations are
\[\large\rm y= 8x+5 \]\[\large\rm y= -8x+5 \]
Since the gradient is the number with x the gradient in first line is 8 and the second line is -8. Now put them in the equation.

\[\large\rm m_1*m_2=-1 \]\[\large\rm 8*-8=-1 \]\[\large\rm -64=-1 \]
Since -64 doesnt equal to -1 these equations are not perpendicular.

Answer 19

Now work out the same reasoning for all the other equations and you will have your answer

Answer 20

im trying to figure these out as quick as possible because i dont have alot of time to do these

Answer 21

and i dont get it

Answer 22

practice makes perfect and practice do takes a hell of a time.
And what part you dont get?

Answer 23

all of it

Answer 24

im timed and i am not gonna be able to finish

Answer 25

okay just apply this
Gradient = - 1/gradient
If the gradient of the first line is 8, then the other should be -1/8. If that doesn't happen they aren't perpendicular.

Answer 26

No nevermind its D.

Answer 27

correct is c

Answer 28

Wait C is right? how?

Answer 29

first line gradient 5, second line gradient -1/5

Answer 30

ohh.

Answer 31

thanks