Top answers

When solving two simultaneous equations, when should you use the method of elimination and when would you use the method of substitution?

I would first always label the two equations as equation 1 equation 2. I would then look to see if you can cancel one of the variables out by adding or subtracting the two equations together. If this is poss...
RC
Answered by Reece C. • Maths tutor
3851 Views

Use completing the square to find the minimum of y = x^2 - 4x + 8

Remember completing the square gives a result of the form (x+q) 2 + p where q and p are numbers Also q is always half of the x term, which in this case is -4, as such q = -2 Substituting this in, we get (x-2...
SD
Answered by Sol D. • Maths tutor
3683 Views

2 5/3 + 2 8/9

2 5/3 = 11/32 8/9 = 24/9 = 8/311/3 + 8/3 = 19/3 = 6 1/3
HR
Answered by Huw R. • Maths tutor
3086 Views

Solve the equation 3x^2+2x-3=3.

rearrange the formula so that it is equal to zero by subtracting 3 from both sides of the equation.3x 2 +2x-6=02) To check if this formula can be factorised you can check if the value of b 2 -4ac for this fo...
JB
Answered by Jolie B. • Maths tutor
4674 Views

Simultaneous equation: (x-3y)=9,(2x+3y)=0

Using one of the equations we express either x in the form of y, or y in the form of x. We then put this expression of x/y into the other equation. This allows us to calculate the numerical values of both x ...
KT
Answered by Kerushan T. • Maths tutor
4766 Views