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3x + 5y = 1   (eq 1)
2x - 3y = 7    (eq 2)

Step 1 -  2* (eq 1) 

6x + 10y = 2  (eq 3)

Step 2 - 3* (eq 2)

6x - 9y = 21  (eq 4)

The table is a cylinder so we'll need to use the equation for this shape: A = πr²h

We're looking for the thickness of the table (which is the height) so let's rearrange this equation to ...

So we know the formula for the area of a circle: πr² 

So all we need to find is the radius²

Radius = Diameter / 2 (Half the diameter)  

            = 70

R...

First put in columns for units, tens, and hundreds. Then count the number of postions between the decimal point and the first digit ( on the left).      H|T|U 2 7 6 4 0 0 0 6 5 4 3 2 1 This is number the ...

Percentage change isn't always as simple as you think. Whilst taking into consideration if it is a percentage increase or decrease, you also need to consider whether you're calculating a result before or ...