Selangor Trial 2025 Add Maths Paper 1, Question 2Linear Law

Solved on video in English · Form 4, Linear Law · 3:40 video

The question

Diagram 2 shows a straight line graph of ln y against x. The line passes through the points (2, 1) and (5, 7).

Express y in terms of x.

Step 1

The graph of ln y against x is a straight line, so ln y = mx + c (Y = ln y, X = x).

Why this step

The vertical axis is ln y, so ln y (not y) plays the role of Y in Y = mX + c. Writing y = 2x − 3 is the classic slip.

3 more steps, each with the reason for it, in the full solution

Final answer

y = e²x − 3)

Where students lose marks

Watch out: the vertical axis is ln y, not y, and you must finish by raising e to both sides.

Watch every step of this question solved on video (3:40), with the reason behind each step and a box that checks your own answer.

No card. Every past-year question on video, in English and BM.