VCE Methods Question Thread!

[Conic]

so when your moving a number or expression over an = sign the signs change but in this case 2y just moves over but the signs say the same?

Yes the sign changes when you move it, but the 2y isn't moving in this case.



Move the -3x+6 to the left:

[Only Cheating Yourself]

Yes the sign changes when you move it, but the 2y isn't moving in this case.



Move the -3x+6 to the left:

2y+3x-2=0 i need to now put that into ax+by+c=0.  So when i move the x and y around the signs say the same?

[Conic]

2y+3x-2=0 i need to now put that into ax+by+c=0.  So when i move the x and y around the signs say the same?

Yes. 2y+3x-2 is the same as 3x+2y-2.

[Only Cheating Yourself]

I still don't know where i am stuffing up!

Find the equation of the line containing each pair of points.  Put into ax+by+c=0

(2,-2) (0,1)

m=1--2=3  0-2=-2 M= -3/2

y-2=-3/2(x-2)

2y-4=-3x+6

3x+2y+10=0??  thats the wrong answer where am i stuffing up?

[Conic]

I still don't know where i am stuffing up!

Find the equation of the line containing each pair of points.  Put into ax+by+c=0

(2,-2) (0,1)

m=1--2=3  0-2=-2 M= -3/2

y-2=-3/2(x-2)

2y-4=-3x+6

3x+2y+10=0??  thats the wrong answer where am i stuffing up?

It should be y+2=-3/2(x-2), as you have y-(-2), which is y+2.

[Only Cheating Yourself]

It should be y+2=-3/2(x-2), as you have y-(-2), which is y+2.

yea my bad but I'm still making a mistake please help me

so yes it should be

y+2=-3/2(x-2)

2y+4=-3x+6
 
now here is where i think i stuff up
i bring the x to the left side to get rid of the -( as we want it in ax+by+c=0)
3x+2y=2
and then to bring the 2 to left side i becomes a positive so
3x+2y-2=0

Wholy crap, i spent like an hour thinking what i did wrong and i finally get it right, about god dam time !  thanks for your help guys

[Only Cheating Yourself]

Find the equation of the line that passes through the point of intersection of the lines whose equations are 7x-3y-19=0 and 3x+2y+5=0, given that the required line is parallel to the line with equations -5x-2y=3

i got c correct by m was wrong.  Here was my working out

I first used the elimination method to find x1 and y1

 7x-3y=19 *2
 3x+2y=-5 *3

14x-6y=38 (+)
9x+6=-15 (+)
=23x=23
x=1

y=7(1) - 3y=19
7-3y=19
-3y=12
y=-4

So far so good ?

now i need to find the gradient

-5x+2y=3
rearrange to make y the subject
2y=5x+3
y=5/2+3/2
M= 5/2

now i have my x1 and y2 (1,-4) and my gradient 5/2 i can solve this question
y+4=5/2(x-1)
2y+8=5x-5
2y=5x-13
5x-2y-13=0
y=-2=13

y=5/2x- 13/2

My answer is wrong.?

[Nato]

Find the equation of the line that passes through the point of intersection of the lines whose equations are 7x-3y-19=0 and 3x+2y+5=0, given that the required line is parallel to the line with equations -5x-2y=3

i got c correct by m was wrong.  Here was my working out

I first used the elimination method to find x1 and y1

 7x-3y=19 *2
 3x+2y=-5 *3

14x-6y=38 (+)
9x+6=-15 (+)
=23x=23
x=1

y=7(1) - 3y=19
7-3y=19
-3y=12
y=-4

So far so good ?

now i need to find the gradient

-5x+2y=3
rearrange to make y the subject
2y=5x+3
y=5/2+3/2
M= 5/2

now i have my x1 and y2 (1,-4) and my gradient 5/2 i can solve this question
y+4=5/2(x-1)
2y+8=5x-5
2y=5x-13
5x-2y-13=0
y=-2=13

y=5/2x- 13/2

My answer is wrong.?

Hey the main mistake i see is ou have copied down one of the equations wrong. In the question you had -5x-2y=3.
but when you were trying to find the gradient, you used -5x+2y=3

[Apink]

Find the equation of the line that passes through the point of intersection of the lines whose equations are 7x-3y-19=0 and 3x+2y+5=0, given that the required line is parallel to the line with equations -5x-2y=3

i got c correct by m was wrong.  Here was my working out

I first used the elimination method to find x1 and y1

 7x-3y=19 *2
 3x+2y=-5 *3

14x-6y=38 (+)
9x+6=-15 (+)
=23x=23
x=1

y=7(1) - 3y=19
7-3y=19
-3y=12
y=-4

So far so good ?

now i need to find the gradient

-5x+2y=3
rearrange to make y the subject
2y=5x+3
y=5/2+3/2
M= 5/2

now i have my x1 and y2 (1,-4) and my gradient 5/2 i can solve this question
y+4=5/2(x-1)
2y+8=5x-5
2y=5x-13
5x-2y-13=0
y=-2=13

y=5/2x- 13/2

My answer is wrong.?

Student0001 is right. You're on the right track though, give it another shot. Can you check the answer again, I think should be , not

[Only Cheating Yourself]

Hey the main mistake i see is ou have copied down one of the equations wrong. In the question you had -5x-2y=3.
but when you were trying to find the gradient, you used -5x+2y=3

Thanks, these stupid errors are killing me! 

[Only Cheating Yourself]

Student0001 is right. You're on the right track though, give it another shot. Can you check the answer again, I think should be , not

Yes, thanks both of use +.  Yes c does =-3/2

I don't want to sound like an idiot, but if I'm making these mistakes, do i really have a chance at methods?  I'm freaking out, i've nearly completed chapter 1 of the methods 1-2 concept book, i've done every question thus far obviously made mistakes but learnt from them.  I'm just really worried if its going to get hard and i get left behind.

[Blues Fan]

Don't stress on little things like that , we all make mistakes. The more questions you do, you will be more aware of the silly mistakes! Methods is hard but it's bearable if you keep on top.

[Apink]

Yes, thanks both of use +.  Yes c does =-3/2

I don't want to sound like an idiot, but if I'm making these mistakes, do i really have a chance at methods?  I'm freaking out, i've nearly completed chapter 1 of the methods 1-2 concept book, i've done every question thus far obviously made mistakes but learnt from them.  I'm just really worried if its going to get hard and i get left behind.

Don't freak out, I think you'll do well in Methods. Why? Because you seek help when you're having trouble and I think that's key in doing well in any subject. It's awesome that you're learning from your mistakes, that's what the questions are designed to do so don't let the number of mistakes bother you. Keep doing questions, keep asking us questions and keep learning from them.

[alchemy]

Keep doing questions, keep asking us questions and keep learning from them.

This. Don't hesitate to PM me with any questions that you feel like your making a silly mistake on and don't want to post here.
And as long as you learn from your mistakes, everything is fine, you're on the right track  (:

[Only Cheating Yourself]

thanks guy, appreciate the help.  Having a good holidays! 

'Don't drink and drive.'