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Solve the simultaneous equations: 3x + y =11; 2x + y = 8

subtract one from the other to eliminate y: 3x+y=11; 2x+y=8 --> x=3substitute value of x back in and solve for y: 3(3)+y=11; 9+y=11; --> y=2

Answered by Israel H. • Maths tutor

2870 Views

(a) Expand and simplify (x − 3)(x + 5), ..2 marks.. (b) Solve x^2 + 8x − 9 = 0 ..3 marks..

(a) Remember: Multiply each term in the left bracket by every term in the right bracket.(x-3)(x+5) = x²+ 5x - 3x -15.Collecting all of the like terms:= x²+ 2x -15.
(b) Solve x

Answered by Jack W. • Maths tutor

8960 Views

What is the difference between simple diffusion and active transport?

Simple diffusion is the movement of a molecules from an area of high concentration to an area of low concentration across a semipermeable membrane. Diffusion happens in liquids and gases as their particle...

Answered by Simi K. • Biology tutor

14692 Views

Solve the equation 2(Sinhx)^2 -5Coshx=5, giving your answer in terms of natural logarithm in simplest form

It doesn't hurt to write down the equation again, so let's do so. Equation: 2(Sinhx)² - 5Coshx = 5 . Hmm, we don't really like to do maths w...

Answered by • Further Mathematics tutor

2561 Views

I don't understand how I am supposed to structure my responses to the longest questions in the exam, can you help?

Long form answers can be difficult to get to grips with so don't worry about finding them intimidating, but hopefully I can give you a few tips that makes them seem a little less daunting. Firstly, I am g...

Answered by • History tutor

1627 Views