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1.Isolate either x or y. in this example you can do this by moving adding y to both sides of the second equation x-y=6 becomes x=6+y2.substitute this into the other equation...
First step is to multiply coefficient of first term (2) with the constant (-12) to enable us to split the middle term.2*(-12) = -24, therefore we need to find two numbers that multiply to -24, and add to ...
The sin rule is used when you need to find a length of a side or an angle. You use the sin rule when you're given an angle, an opposite side length and also an angle or side length opposite to the one you...
x2 - 9 = 4x + 12 x2 - 9 - 4x = 12 x2 - 9 - 4x -12 = 0 x2 - 4x -21 = 0 Factorise into form (x + ?)(x + ?) Factors of -21 ar...
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