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Firstly work out how many days Chen bought a sandwich, which was one fifth of 45 days. So 45/5 = 9. We then multiply 9 by the cost of a sandwich, 92.75 = 24.75. The remaining days Chen must have bough...
To begin we need to simplify the expression. First we multiply out (4x–5)^2 to get 16x2+40x+25 and then we multiply out 5x(3x – 8) to get 15x2-40x. This makes the whole expression 16...
This question was very difficult to explain through words; if it were to be used in a question paper, it would be presented as a diagram. I intend to use the whiteboard during the inteview to explain both...
You are trying to find out the value of 'x' and the value of 'y'.
This means that you need to be able to take away one equation from the other.
3x + 2y = 4 - we are going to times this equ...
5x+6y=3 2x-3y=12 6y=3-5x 2x=12+3y 3y=2x-12 Therefore, 6y=2(2x-12)=4x-24 4x-24=3-5x 9x=27 x=3
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