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Solve the simultaneous equations 3x + y = -4 and 3x - 4y = 6

When solving simultaneous equations our goal is always to use the equations given, which each have two unknowns in them, in order to find an equation with only one unknown. In this example, we can see tha...

Answered by Sofya E. • Maths tutor

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If A is divided by B, the result is 5/7. If B is divided by C, the result is 4/5. What is the result of A divided by C ?

A=5 when B=7, B=4 when C=5. (Using Ratios, 5:7 & 4:5)
Knowing the relationship between both A & C with B means that we can find the relationship between A&C themselves. (A=5, B=7)*4 ; ...

Answered by Inez A. • Maths tutor

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Solve the simultaneous equation: 2x + y = 18 and x−y=6

Check to see if the number in front (coefficient) of either the x's or y's is the same. In this case both the y's have the same coefficient so we do not need to make them the same.We are going to add the ...

Answered by Chelsea K. • Maths tutor

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How do I find the roots of a quadratic equation?

A quadratic equation has the form ax² + bx + c Our goal is to find values of x such that ax² + bx + c = 0These values of x are known as the "roots" of the quadratic.

Answered by Zach T. • Maths tutor

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How do you work out the median of a set of numbers?

The median is the middle number of a set of ordered numbers, i.e. halfway along. To find the median of the data set you should arrange the numbers into order, lowest to highest. Count equally from both en...

Answered by Lydia K. • Maths tutor

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