Linear equation help! (1 Viewer)

[triheart]

Stuck in this question. Find the equation of the line in exact general form, which has an angle of inclination of 30 degrees and passes through the point (4,-3) Which formula do i use??

 

[Dragonmaster262]

Stuck in this question. Find the equation of the line in exact general form, which has an angle of inclination of 30 degrees and passes through the point (4,-3) Which formula do i use??

I think all you have to do is use tan30 to find the gradient. After that you use the two point formula to find the line equation.



After that just change your answer to general form. Remember that you cannot have any fractions in general form.

 

[Dragonmaster262]

Can anyone do this?



I know how but I want to check my answer and see if my working out is right.

 

[shuning]

回复: Re: Linear equation help!

Can anyone do this?



I know how but I want to check my answer and see if my working out is right.

square both sides ^^

 

[duckcowhybrid]

Can anyone do this?



I know how but I want to check my answer and see if my working out is right.

Graph it and read the solutions off the graph.

 

[triheart]

so tan 30 = 0.577 (round off) and use that as my gradient?

 

[gurmies]

so tan 30 = 0.577 (round off) and use that as my gradient?

Better to use exact values, i.e. 1/sqrt3

 

[triheart]

Oh nice thanks man and can anyone tell me the answer if mines correct.

 

[shuning]

回复: Re: Linear equation help!

Graph it and read the solutions off the graph.

oh yea way easier xD

 

[Lukybear]

Can anyone do this?



I know how but I want to check my answer and see if my working out is right.

U sure thats a five? Cause thats a bit messy...

But i got

(-1-rt21)/2 <= x <= (1+rt21)/2

You can also check using calculator btw.

 

[Drongoski]

U sure thats a five? Cause thats a bit messy...

But i got

(-1-rt21)/2 <= x <= (1+rt21)/2

You can also check using calculator btw.

This answer is correct.

 

[Dragonmaster262]

U sure thats a five? Cause thats a bit messy...

But i got

(-1-rt21)/2 <= x <= (1+rt21)/2

You can also check using calculator btw.

Why 'Less than'? Aren't both signs to be 'Less than or equal to'?

 

[random-1005]

so tan 30 = 0.577 (round off) and use that as my gradient?

it says use exact values in the question, noob
a person thats doing three unit shouldnt need to ask that question, its the easiest 2 u Q u could ever get, you dnt belong in 3unit son.

 

[triheart]

"Stuck in this question. Find the equation of the line in exact general form, which has an angle of inclination of 30 degrees and passes through the point (4,-3) Which formula do i use??" Did the question directly asked exact value?? it is only assume that you use it dummy i think you that you thought exact general form = exact value