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Question 27

(a).

Given that $x\,$ and $y\,$ are integers, show that $3 x + 2 y$ is an integer.

[1]

(b).

Use proof by contradiction to show that there exist no integers $x\,$ and $y\,$ for which $30 x + 20 y = 7$ .

[3]

Markscheme

Algebraic Methods Questions

A Level
Maths
Algebraic Methods

368 exam-style questions on Edexcel A Level Maths Algebraic Methods, covering 1.1 Proof by Contradiction, 1.2 Algebraic Fractions, 1.3 Partial Fractions, 1.4 Repeated Factors, and 1.5 Algebraic Division. Each one has a worked solution and a mark scheme showing where the marks go.

Algebraic Methods

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Algebraic Methods

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Question 27

(a).

Given that $x\,$ and $y\,$ are integers, show that $3 x + 2 y$ is an integer.

[1]

(b).

Use proof by contradiction to show that there exist no integers $x\,$ and $y\,$ for which $30 x + 20 y = 7$ .

[3]

Markscheme

Algebraic Methods Questions

A Level
Maths
Algebraic Methods