Selangor Trial 2025 Add Maths Paper 2, Question 1Systems of Equations

Solved on video in English · Form 4, Systems of Equations · 5:10 video

The question

Solve the following simultaneous equations: x + 2y − z = 3, 2x − y + 3z = 1, 3x + 4y − 2z = 5

Step 1

Label the equations: x + 2y − z = 3 ... (1); 2x − y + 3z = 1 ... (2); 3x + 4y − 2z = 5 ... (3).

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

Final answer

x = −1, y = 3, z = 2

Where students lose marks

Watch out: when subtracting one equation from another, change every sign in the second bracket, show the +/− step, and find all three unknowns.

Watch every step of this question solved on video (5:10), 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.