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solve the simultanious equations: x - 2y = 2 and 2x + y = -1

I would first isolate x in the first equation in the left hand side (x = 2 + 2y). Then I would replace the x in the second equation with the right hand side of the first equation, making the second equation ...
PS
Answered by Pedro S. • Maths tutor
4212 Views

Factorize 2(x^2) - 2x - 12 fully

2(x 2 ) - 2x - 12= 2( x^2 - x - 6)The constant is negative so the 2 factors must have opposite signs. Then, the x term is negative so the larger one must be negative, and the smaller one positive. 2*(x3)=-6 ...
DH
Answered by Danielle H. • Maths tutor
3777 Views

How do you prove a mathematical statement via contradiction?

For a proof via contradiction , you would start by assuming the statement is actually false 1 (even if the given statement seems inherently correct, it is essential for the proof). Now that you have a basis ...
JS
Answered by Jake S. • Maths tutor
4009 Views

Rearrange 4(2x + y) = 11 + 7y to make x the subject

4(2x + y) = 11 + 7y expand the brackets8x + 4y = 11 + 7y move +4y to the other side8x = 11 + 3y move 8 to the other sidex= (11 + 3y)/8
AY
Answered by Ashley Y. • Maths tutor
6964 Views

3^a = 1/9, 3^b = 9sqrt(3) c = 1/sqrt(3). Work out the value of a + b + c

I will explain best during the interview on the whiteboard space
EC
Answered by Eduardo C. • Maths tutor
12005 Views