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How do you solve simultaneous equations?

There are two main methods:Substitution and elimination which can be demonstrated on the white board.

Answered by Adham C. • Maths tutor

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Celine has £5 to buy pens and rubbers. Pens are 18p each. Rubbers are 30p each. She says “I will buy 15 pens. Then I will buy as many rubbers as possible. With my change I will buy more pens.” How many pens and how many rubbers does she buy? [5 marks]

Solve the simultaneous equations: 3x + 2y = 4 and 4x + 5y = 17

Using simultaneous equations find x & y. Equation A: 3x + 2y = 3 -y and Equation B: 5x + 3y = 6 + x

Factorise and solve x^2 - 8x + 15 = 0.

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