WMA11 Jan 2019

2.​​ WMA11/01​​ Edexcel IAL P1 January 2019, Q2 (Algebraic Expressions: Indices)

Given​​ 

3x34y=273

find y as a simplified function of x.​​ 

(3)

SOLUTION​​ 

3x34y=273

Applying the indices rule as per the requirement from​​ the following flash card.​​ 

3x-4y=33x 312

3x-4y=372

x-4y=72

x-72=4y

2x-72=4y

y=2x-78