# Is my answer correct?

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#22

(Original post by

I am very confused right now

**Kakakaty**)I am very confused right now

Via the equation of the line, trigonometry etc...?

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#23

(Original post by

Not sure what you mean?

**mqb2766**)Not sure what you mean?

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#24

(Original post by

I am very confused right now

**Kakakaty**)I am very confused right now

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(Original post by

How have you been taught to calculate a gradient?

Via the equation of the line, trigonometry etc...?

**Always_Confused**)How have you been taught to calculate a gradient?

Via the equation of the line, trigonometry etc...?

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#26

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for A i got 3 and for B i got 2.5

I know that their gradients will multiply together to give -1 but from the gradient I got they don't equal -1 so does that mean theyre not perpendicular or did i do my calculations wrong?

**Kakakaty**)for A i got 3 and for B i got 2.5

I know that their gradients will multiply together to give -1 but from the gradient I got they don't equal -1 so does that mean theyre not perpendicular or did i do my calculations wrong?

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(Original post by

Get the gradient of each line first. How do you calculate them - see the maths is fun link.

**mqb2766**)Get the gradient of each line first. How do you calculate them - see the maths is fun link.

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#28

(Original post by

The change in Y divided by change in X

**Kakakaty**)The change in Y divided by change in X

(Original post by

I have done this, I got A=3 B=2.5. I followed the steps on the website are my answers incorrect?

**Kakakaty**)I have done this, I got A=3 B=2.5. I followed the steps on the website are my answers incorrect?

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#29

(Original post by

I have done this, I got A=3 B=2.5. I followed the steps on the website are my answers

**Kakakaty**)I have done this, I got A=3 B=2.5. I followed the steps on the website are my answers

Gradient = (y2 - y1)/(x2 - x1) = 1/3

Do the same thing for two points on line B.

Do the gradients multiply to -1?

If yes: lines are perpendicular

If no: lines are not perpendicular

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This is an image of what I did so for line A I have the y value (2) and the x value (6) 2/6 = 0.3. and then for line B I have the y value of 5 and the x value of 2. 5/2 = 2.5. Where am I going wrong?

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#31

(Original post by

This is an image of what I did so for line A I have the y value (2) and the x value (6) 2/6 = 0.3. and then for line B I have the y value of 5 and the x value of 2. 5/2 = 2.5. Where am I going wrong?

**Kakakaty**)This is an image of what I did so for line A I have the y value (2) and the x value (6) 2/6 = 0.3. and then for line B I have the y value of 5 and the x value of 2. 5/2 = 2.5. Where am I going wrong?

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(Original post by

Line A is now correct 0.333... Line B goes down, so what does that mean for the gradient (change in y)?

**mqb2766**)Line A is now correct 0.333... Line B goes down, so what does that mean for the gradient (change in y)?

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#35

(Original post by

-0.75 ?

**Kakakaty**)-0.75 ?

It's close to -1 but not quite equal.

The lines are almost perpendicular (eyeballing them) but not quite when you do the numbers.

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(Original post by

Well it's -5/6 without the rounding.

It's close to -1 but not quite equal.

The lines are almost perpendicular (eyeballing them) but not quite when you do the numbers.

**mqb2766**)Well it's -5/6 without the rounding.

It's close to -1 but not quite equal.

The lines are almost perpendicular (eyeballing them) but not quite when you do the numbers.

One last thing

Would this be ok for my final answer -

The lines A and B would not be perpendicular this is because in order for them to be perpendicular their gradients must multiply together to get -1. Line A's gradient is 0.333.... and Line B's gradient is -2.5. When multiplying these together you get -5/6 (0.83333...). Therefore, this means they are not perpendicular as they do not multiply together to get -1.

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#37

(Original post by

Woooo thankyou for you help.

One last thing

Would this be ok for my final answer -

The lines A and B would not be perpendicular this is because in order for them to be perpendicular their gradients must multiply together to get -1. Line A's gradient is 0.333.... and Line B's gradient is -2.5. When multiplying these together you get -5/6 (0.83333...). Therefore, this means they are not perpendicular as they do not multiply together to get -1.

**Kakakaty**)Woooo thankyou for you help.

One last thing

Would this be ok for my final answer -

The lines A and B would not be perpendicular this is because in order for them to be perpendicular their gradients must multiply together to get -1. Line A's gradient is 0.333.... and Line B's gradient is -2.5. When multiplying these together you get -5/6 (0.83333...). Therefore, this means they are not perpendicular as they do not multiply together to get -1.

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(Original post by

Fine, but I'd really recommend you do some more practice on the line / gradient basics.

**mqb2766**)Fine, but I'd really recommend you do some more practice on the line / gradient basics.

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#39

(Original post by

I agree, I really need to, It seems the information never stays in my brain. I've tried finding resources online of where I can practice linear graphs, gradients etc but I can't find many resources which have ways to practice.

**Kakakaty**)I agree, I really need to, It seems the information never stays in my brain. I've tried finding resources online of where I can practice linear graphs, gradients etc but I can't find many resources which have ways to practice.

you can get questions about all parts of the syllabus graded 1-4, including this topic.

Tbh, most gcse maths sites will have questions about this. Just have a look at the usual suspects, after trying drfrostmaths.

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(Original post by

drfrostmaths.com

you can get questions about all parts of the syllabus graded 1-4, including this topic.

Tbh, most gcse maths sites will have questions about this. Just have a look at the usual suspects, after trying drfrostmaths.

**mqb2766**)drfrostmaths.com

you can get questions about all parts of the syllabus graded 1-4, including this topic.

Tbh, most gcse maths sites will have questions about this. Just have a look at the usual suspects, after trying drfrostmaths.

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