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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

2687 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

8244 Views

Simplify the following expression: √48+√(16 3/9) Give your answer in the form: (a√3)/b where a and b are integers.

The key to this question is to stay calm and not let yourself be intimidated. You can use the information provided in the question to give you a clear direction to head in- you want to factorise out root ...

Answered by Rob W. • Maths tutor

2759 Views

Differentiate the equation 3x^4+6x^2-7x+2

To differentiate, multiply the power by the coefficient and then take one off the power so the answer is 12x³+ 12x - 7

Answered by Aimee S. • Maths tutor

2293 Views

Write an equation for a line parallel to 2y = 4x - 10

Divide the equation by two to get y = 2x - 5This shows that the gradient of the line is 2. Any other equation with the gradient equal to 2 (the x coefficient) when the y coefficient is 1.e.g. y = 2x +12 <...

Answered by Aimee S. • Maths tutor

3030 Views