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I need help understanding simultaneous equations with more than two variables, can you please help?

Working with more than 2 variables in simultaneous equations can be daunting at first, but as long as you apply the same methods you have learned for simpler problems, you will get used to these more comp...

Answered by Sam M. • Maths tutor

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There are 720 boys and 700 girls in a school. The probability that a boy chosen at random studies French is 2/3 The probability that a girl chosen at random studies French is 3/5. Work out the number of students in the school who study French.

The probability that a boy chosen at random studies French is 2/3. This is also a proportion. It says that for every 3 boys, you can say that 2 of them will study french. It is also close to 66% as it can...

Answered by Tutor132640 D. • Maths tutor

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how to solve a quadratic inequality

in the case you have ax²+bx+c>n where a,b,c and n are all real integers (non fractions, ration numbers that can be +ve or -ve) use the quadratic formula [-b+/-(b²-(4c))^1/2

Answered by J B. • Maths tutor

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A is (2, 12) and B is (8, 2) Calculate the midpoint of AB.

Find the difference between the x co-ordinates and divide by two, apply the same principle to the y co-ordinates
Answer: (5,7)

Answered by Ashan D. • Maths tutor

7040 Views

Solve the simultaneous equations: 6x + 3y = 42 4x + 7y = 38

6x + 3y = 42 => y = 14 - 2x (1 method mark)4x + 7y = 38 (substituting in y) => (1 method mark) 4x + 7(14 - 2x) = 384x + 98 - 14x = 38-10x + 98 = 3860 = 10x => x = 6 (1 answer mark) => y = 14 -...

Answered by Daniel T. • Maths tutor

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