Top answers

Q: How to solve the simultaneous equations 3x+2y=7 and 5x+y=14

When solving simultaneous equations you are aiming to use both equations together to find out the value of x and y for values that with ‘fit’ in each equation. 3x + 2y = 7 5x + y = 14 If we subtract these eq...
KM
Answered by Katherine M. • Maths tutor
12574 Views

Make x the subject of the equation y = {2(1+x)}/(3x+1)

This is an A* grade extension GCSE maths question on rearranging equations. The question is asking us to find an equation that would represent x . In the question this x appears on the denominator (bottom ha...
KG
Answered by Katrina G. • Maths tutor
7426 Views

Where does the geometric series formula come from?

Rearranging the terms of the series into the usual "descending order" for polynomials, we get a series expansion of: ax n-1 + ........ax + a A basic property of polynomials is that if you divide x ...
NA
Answered by Naheem A. • Maths tutor
5124 Views

The points P (2,3.6) and Q(2.2,2.4) lie on the curve y=f(x) . Use P and Q to estimate the gradient of the curve at the point where x=2 .

To answer this question you will need to recall the formula for the gradient of a straight line. Cordinates are written in the form (x ​1,x 2 ​) and (y 1, ​y 2 ​). The formula takes into consideratoon the co...
AY
Answered by Abdulmuminu Y. • Maths tutor
6910 Views

Solve the quadratic equation x^2 + 4x +1 = 0 by completing the square.

Completing the square means to put our equation into a slightly different form which looks like this, where a and b are real numbers: (x+a) 2 + b = 0 From here, we can rearrange the equation and directly sol...
AP
Answered by Andrew P. • Maths tutor
87941 Views