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Minus 2x+y=8 from 3x+y=11 so that the y's cancel out (y-y=0).Then we get the equation 3x-2x=11-8.So we get x=3.We can substitute this value back into one the orginal equations: y=11-3(3)=2 - so y=2....
(A-level Maths)Simultaneous equations: 1) y = 3x -2 2) x + 3y = 1Substitute y = 3x - 2 into equation 2:...
First, the surds need to be simplified. Surds can be simplified by finding the highest square number that is a factor of the number in the square root.√12 = √(4 x 3) = √4 x √3 = 2√3√75 = √(25 x 3) = √25 x...
5y = 45y = 45/5y = 9
x2 - 6x + 9The method for factorising quadratics is to find 2 numbers that add to make the 'x' term (-6x in this case), and multiply together to make the final term (+9 in this case). Factors o...
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