Question

-4x+y=-7 (4,3) Write the equation of a line that passes through the given point and is perpendicular to the given line in slope intercept form

Answer 1

Make y the subject by moving the -4x to the other side.

Answer 2

When I move it I would get y=-4x-7

Answer 3

Nope. You do know that once you move something to the other, the sign of the term switches.

Answer 4

other side*

Answer 5

so then that means it would be y=4x-7 ??

Answer 6

yep, now just repeat the process from the last problem

Answer 7

Yes. Good work.

Answer 8

When you do these line problems, always start off by making y the subject. Makes your life much easier.

Answer 9

haha thanks so since were doing the reciprocal of -4 the sign is the only thing that is changing right? so it wouldnt be as a fraction?

Answer 10

?...Could you start from the beginning, because what you said is a bit confusing. And you said -4 when clearly you corrected yourself in the equation saying that it is 4x, not -4x.

Answer 11

And to find the gradient of the line perpendicular, you would have to get the negative reciprocal....not the reciprocal.....

Answer 12

Also, the reciprocal of an integer is fraction.

Answer 13

oh ok so it wouldnt be left as a fraction right?

Answer 14

what's a negative reciprocal?

Answer 15

its for example : 3 the negative reciprocal will be -3

Answer 16

is that right?

Answer 17

I told you a reciprocal is the inverse of a number meaning the inverse fraction.

Answer 18

reciprocal of 2 is 1/2

Answer 19

The phrase negative reciprocal has the word recirpocal in it. What can you tell me about that?

Answer 20

reciprocal*

Answer 21

ohhhhh ok then I think I get it know

Answer 22

So what's the negative recirpocal of 4?

Answer 23

reciprocal*

Answer 24

It would be -1/4

Answer 25

Yes, well done. Now I think you're good to go with these types of questions.

Answer 26

I've tried the problem,tell me I'm correct will the answer to the whole problem be y=-1/4x+4 ?

Answer 27

???