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# C1 OCR-line equations watch

1. Hi guys couple questions on math paper can't do can someone show a step by step analysis?

A is the point (4,-3) and B is the point (-1,9)

calculate AB... which was 13
Find MP AB which was (1.5,3)

Find equation of line through (1,3) which is parallel to AB, giving yuor answer in the form ax+by+c A,b,c are integers

NEXT..

Point P on the curve y=kx^1/2 has x coordinate 4. Normal to the curve at P is parallel to the line 2x+3y=0....(6)

Find K

thanks all
2. ok i think for first answer i got equation -2x-y+5=0 is this correct??
3. 1) all you need is the gradient AB. y-y1=m(x-x1)
2)find the gradient of the line 2x+3y=0
find dy/dx of kx^1/2 where x=4
the gradient of that line where x=4 ... well, its perpendicular to the line 2x+3y=0. what does that tell you?
4. (Original post by ashton.alfred)
ok i think for first answer i got equation -2x-y+5=0 is this correct??
Well done...do you want a gold star or chocolate bar? How on earth does this help the poster understand anything other than your attempt at a core 1 question?

To the OP

What is the 6 in here?

Point P on the curve y=kx^1/2 has x coordinate 4. Normal to the curve at P is parallel to the line 2x+3y=0....(6)
As for the question

(i) are you happy differentiation that?
(ii) finding the corresponding y coordinate?
(iii) ok on appreciating the difference between normal and tangent?
iv) Ok on subbing that into a linear equation?
5. (Original post by LJbrowning)
Well done...do you want a gold star or chocolate bar? How on earth does this help the poster understand anything other than your attempt at a core 1 question?

To the OP

What is the 6 in here?

As for the question

(i) are you happy differentiation that?
(ii) finding the corresponding y coordinate?
(iii) ok on appreciating the difference between normal and tangent?
iv) Ok on subbing that into a linear equation?
That was the poster

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