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Depending on what you prefer, you can either substitute or you can try to solve this by elimination. I'll explain both. 1) x - 2y = 1 2) x 2 - xy +y 2 = 1 If solving by elimination, you need to start thinkin...

A sequence means a pattern, so the first thing to do is find the pattern. First try seeing what the difference between the numbers is. 15-7=8, 8-7=1, 1-7=6, so the pattern must be to subtract 7 each time. Th...

To find the derivative of any number to the power "x", such as 2 x , 5 x , or even 4.13 x , we first consider the general form a x . We need to be a little creative here. We know that any variable ...

diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they pass...

risk factor is something which increases your chance of developing a particular disease. risk factor of coronory heart disease is diet due to the atheroma developed from the fatty material deposited in the a...