4x – 3y=8
2. 5x – 2y = -11
1 answer:
Answer:


Step-by-step explanation:
The given system is:
4x-3y=8
5x-2y=-11
We make x the subject in the top equation to get:

Plug this expression for x in the bottom equation to get

We expand to obtain

Multiply through by 4

Group similar terms



This means


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Each successive term is -5 times the previous one, so the underlying sequence is

The sum can then be written as