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The point P has coordinates (3, 4) The point Q has coordinates (a, b) A line perpendicular to PQ is given by the equation 3x + 2y = 7 Find an expression for b in terms of a.

3x-2y=7. y=-3/2x+7/2. mn=-1. m=2/3. m=dy/dx. 2/3=4-b/3-a. 4-b=2-2/3a.b=2/3a+2

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

Rearrange first equation so we can eliminate one variable: y= - 4 -3x We can then plug this into the second equation so we get rid of the y's and just have x's: 3x-4(-3x-4)=6Simplify this: 3x + 12x+16=6...

Answered by Anushka C. • Maths tutor

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How do you solve linear algebraic equations?

3 simple steps: Expand out brackets. Group like terms together. Make x the subject of the equation.

Answered by Athul P. • Maths tutor

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Should I always plan my essays during exams, even when there is not a lot of time available?

Firstly, you need to take into account that each person is different, and the only way for you to understand what works best for you is by practicing. However, there are a few things you can do that will ...

Answered by Catarina S. • Business Studies tutor

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Factors that affect the demand of a good or service?

To remember some of the factors that affect the demand of a good or service, just learn the mnemonic PIPCA:Price (of the product)Income Price of substitutes Consumer tasteAdvertisement

Answered by Maria N. • Economics tutor

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