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x^2 +y^2 =25, y – 3x = 13 - Simultaneous Equations (June 2017)

x = -4.8x = -3

Answered by Angelo U. • Maths tutor

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4x+2y=22, (y/2)+(x/4)=2.5

x=4,y=3

Answered by Ieuan L. • Maths tutor

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2 chocolates weight 250g, there are 220 calories in 100g of chocolate. How many calories are in one chocolate?

275 Calories

Answered by Ieuan L. • Maths tutor

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Solve these simultaneous equations: 3x-5=-4y and 2xy=-4

First start with 2xy=-4, rearrange to find in terms of x, x=-2/y. Substitute this into the other equation (3x-5=-4y), producing -6/y -5 =-4y.Times every term by -y resulting in 6+5y=4y².Rearr...

Answered by Amelia S. • Maths tutor

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When working with probabilities why is it sometimes necessary to add and sometimes to multiply?

Whether you need to add or multiply depends on whether it is a case of 'AND' or 'OR'. For 'AND' you multiply, and for 'OR' you add. Below are examples of each case, using dice as an example: To calculate ...

Answered by Marcus W. • Maths tutor

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