Q2 of 23 Page 1

Attempt any four subquestions from the following:

For solving the following simulataneous equations by Cramer’s rule, find the value of Dx and Dy:3x-y = 7; x + 4y = 11.

Given: 3x-y = 7; x + 4y = 11.

Dx =


Dx = ad - cb


= (7 × 4) – (11 × -1)


= 28 – (-11)


= 28 + 11 = 39


Dy =


Dy = ad - cb


= (3 × 11) – (1 × 7)


= 33 – 7


= 26


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