ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: flash36 on April 12, 2010, 07:51:53 am

Title: Core Question
Post by: flash36 on April 12, 2010, 07:51:53 am

Question 14 of the multiple choice questions in the attachment.

Can someone help me out with this? How do you work it out?

Title: Re: Core Question
Post by: kriptik on April 12, 2010, 11:29:24 am

it should be D since the yintercep is at 1  and the gradient is positive, it cant be B since the points given are not similar after substituting

Title: Re: Core Question
Post by: crayolé on April 12, 2010, 08:22:23 pm

Well first of all, you know the constant is +1 as that is where the y intercept passes

Now for the gradient, see how two of the boxes are darkened? That means they fit on the line perfectly. So we can therefore find the gradient using these points.

You can find the gradient two different ways
y2-y1
x2-x1

or

rise
run

The two points are (2,5) and (4,8)
8-5
4-2
=3
  2

After rounding, the closest answer there would be D
Sorry if I didnt make myself clear